Malicious PDF — malware analysis report

Static analysis result for SHA-256 7582806a88faf0e1…

MALICIOUS

PDF

84.1 KB Created: 2021-04-01 14:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 008e69f10ef9b39cd7a1802a2d708e31 SHA-1: 5c4d7e447a487541736c4937d2cef3e1201dd3c6 SHA-256: 7582806a88faf0e157a52516de1e04b2f2eb084dedc8fd532caff3f2485fe506
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the structure itself is indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/award?keyword=aisi+1020+properties+pdf PDF link annotation
    • https://topalezomezo.weebly.com/uploads/1/3/4/3/134305389/d329347c0.pdfIn PDF document text
    • http://fetedeju.mygamesonline.org/modern_high_end_valve_amplifiers.pdfIn PDF document text
    • http://rekatilugo.iblogger.org/kenmore_front_load_washer_will_not_turn_on.pdfIn PDF document text
    • https://famereruzune.weebly.com/uploads/1/3/1/6/131637342/nonetiju-kubowu-nesovafume.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/grade_11_chemistry_textbook_nelson.pdfIn PDF document text
    • http://jonebosu.mywebcommunity.org/bijak.pdfIn PDF document text
    • https://xebolefijepipol.weebly.com/uploads/1/3/0/7/130739937/liturok.pdfIn PDF document text
    • https://fojexoduzasob.weebly.com/uploads/1/3/4/6/134693365/xugevisijovonuj.pdfIn PDF document text
    • https://napuximijagebi.weebly.com/uploads/1/3/4/7/134766840/83cb9ba7e1e1b34.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zasepo/hootsuite_app_not_ing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72b14a95-6a91-41ae-9799-232f29e64d63/fivinolarik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a19efee0-f0b9-4182-95ba-4c12240d8d4b/how_to_download_microsoft_access_2010_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d4f2832-6692-40ba-ac94-9574ffcfcf6d/diesel_generator_for_sale_second_hand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cdfc5bd-5051-4b50-bf9d-0fe0f699ae96/what_is_the_difference_between_primary_and_secondary_drinking_water_standards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fa001b3-017e-4ad2-b5fa-4d3b88931d96/pet_sematary_original_full_movie_online.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/bupajonoz.pdfIn PDF document text
    • http://vafatosiwajufo.epizy.com/courts_of_heaven_prayer_for_healing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6558ddb9-da87-46da-8a2b-924ff8e02834/mitologia_dioses_griegos_y_romanos.wmv.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/rowimemepabidupajerofu.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/indiana_state_football_injury_report.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE948 3028 bytes
SHA-256: f56f148d1e7bdf713a7a26301867bfa905e041d7fbf8f243227185f893f013f3
font_01_sfnt_off0000f410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF410 5108 bytes
SHA-256: b19da135bec22dd5c5f9e606444680b22aecec1ef60d57f8c6f9004c923df66e
font_02_sfnt_off00010590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10590 11320 bytes
SHA-256: d5977f0b5ee1bd8bb9461ff3bedba58af67685fd70d46562a4ad4583ed67837a
font_03_sfnt_off00012c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C81 16260 bytes
SHA-256: 1b3a7c1b7bc451495b69e6c2dc925dfa634ebf3cd17a1c22ac82dde46aeedc8f