Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2c62eef77bc595…

MALICIOUS

PDF

85.4 KB Created: 2021-06-04 00:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 53969b7f9f2be3a8d4edb4548d8d6d84 SHA-1: c47e2b473193b9dd6acac75e4ca282fc93b60034 SHA-256: aa2c62eef77bc595e8f141cf73b16692ec38f8969b1c2648d0615472bd4c4ae4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crewmak.ru/pbw?utm_term=how+old+is+pilar+pascual PDF link annotation
    • https://vevikonupefafo.weebly.com/uploads/1/3/5/3/135391347/9078289.pdfIn PDF document text
    • https://dudunubute.weebly.com/uploads/1/3/4/1/134132035/vidunewifa_fufelajasapa_tavavenazoxete.pdfIn PDF document text
    • https://norokeveja.weebly.com/uploads/1/3/4/7/134706326/175ed1e1a1091d.pdfIn PDF document text
    • https://kopiwuzurori.weebly.com/uploads/1/3/1/3/131398237/2517171.pdfIn PDF document text
    • https://moxuvobojivoz.weebly.com/uploads/1/3/0/8/130873852/3551130.pdfIn PDF document text
    • https://pozemake.weebly.com/uploads/1/3/0/7/130776760/20701e4a2c.pdfIn PDF document text
    • https://gigumozogewa.weebly.com/uploads/1/3/4/5/134597084/cc904f.pdfIn PDF document text
    • https://numemepo.weebly.com/uploads/1/3/0/9/130969514/gedid_botodomalav_boxazisew_tilawezefis.pdfIn PDF document text
    • https://zitozujenuzudip.weebly.com/uploads/1/3/4/0/134042901/dabutifoxito.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d4e1d1b4-3b54-4706-853d-5bb6819e9e53/tilefatagugoridunok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3018f01f-1af1-406f-8f4a-e59541003861/nomuditewadixujuwatukok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64b1c181-2f0b-4257-b317-bd017b87a7da/que_responder_ante_una_propuesta_indecente.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1cdd667-82b0-4e75-82c9-3856565f523c/luvoxelatelobuxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45e46fc0-4da4-4102-8f75-ce201924c1f8/how_to_use_weber_universal_smoker_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93eafc21-b8a8-4c94-a8fc-0d04b35ecea9/basewub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b1a8979-1d51-4042-b3f9-6c0a4beccfe9/william_shakespeare_sonnet_42_analysis.pdfIn PDF document text
    • http://kefimazusob.pbworks.com/w/file/fetch/144424623/11522464588.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/w/file/fetch/144485424/harry_potter_and_the_goblet_of_fire_book_cover_bloomsbury.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d2db2cb-8f07-4e8a-8cc7-da68de13d8e9/what_are_the_latest_coronavirus_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31179f6d-6f73-4dc8-83f8-161da647a8ab/cabelas_heavy_duty_meat_slicer_manual.pdfIn PDF document text
    • http://vazesuna.pbworks.com/w/file/fetch/144520551/circulatory_system_practice_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d1cd2ff-58c1-4175-9011-28d6bdec10f6/why_does_my_router_light_keep_blinking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70a5c936-b7c0-447a-aaf6-1fdd0a75f7df/when_did_christianity_begin_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96c4dca9-df25-4d0c-87d6-a790a48b8f39/do_igloos_collapse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4432c850-716b-493b-a55d-2b9a7312ce07/how_to_draw_with_gimp_2.10.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 3084 bytes
SHA-256: 3137d109678946ce85cbae362ee9be490d71b6ea123ef96841b1fe755f187e81
font_01_sfnt_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 4700 bytes
SHA-256: af762d3ac13108391478dd937dc046a7f9aa8bae7266cdf20d097ac32296c1fe
font_02_sfnt_off00010afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFB 14308 bytes
SHA-256: 1bc5dc446459283ca7feb13045eea9c8308e3a32f1065dc157dcebaeb739c0d5
font_03_sfnt_off000138d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D5 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361