Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9530cc4a74f031…

MALICIOUS

PDF

80.8 KB Created: 2021-05-22 05:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 29475a3e80f4e4a2dca035b8265e228f SHA-1: 1e43a756e003aded673bb5f869d2e03669def6cc SHA-256: 9b9530cc4a74f03136b97824dd8fc5c6583bcaa2863fa35a1b9cd82caf206eaf
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/strik?utm_term=how+to+set+thermostat+to+emergency+heat PDF link annotation
    • https://bulogisovorave.weebly.com/uploads/1/3/4/5/134597537/xojaxasazixof-sogemivusame-ribopuwudur-xekorebivod.pdfIn PDF document text
    • https://musixafura.weebly.com/uploads/1/3/5/3/135321149/nejowedoxoliri-kiwopu-lumiwevozaz.pdfIn PDF document text
    • https://mitafewojoruwe.weebly.com/uploads/1/3/1/3/131381680/8625924.pdfIn PDF document text
    • https://malabukepi.weebly.com/uploads/1/3/0/9/130969546/beborebu_lipirubuj_kekodos.pdfIn PDF document text
    • https://linugezi.weebly.com/uploads/1/3/4/2/134265501/4759980.pdfIn PDF document text
    • https://dopijixofovaje.weebly.com/uploads/1/3/4/6/134692352/eebd6354bdf182.pdfIn PDF document text
    • https://kapebuzuzevasa.weebly.com/uploads/1/3/4/5/134587117/b7733.pdfIn PDF document text
    • https://kadibunafi.weebly.com/uploads/1/3/0/9/130969561/ditugulibip-jofivitobaxuwa-bobepaba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/725421ea-d2d2-44d4-9b3d-f1b5e0176f66/music_notes_names_and_symbols_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/astro_palmistry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15b3f281-b590-4bc7-a1db-6efae81bb30f/how_to_use_the_graco_magnum_project_painter_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bdb0b28-bba7-487f-9806-d1b4480fc83b/72786393297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f46e4a2-dab0-468d-be9a-003d0f61234c/is_ghost_alive_in_power_book_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24f105c9-1a24-4473-8548-0b6f26cc197d/rain_down_jaime_cortez_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/sinodedek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10bd7ab4-0e12-4202-9e1a-9c5e71bedb8e/golds_gym_300ci_exercise_bike_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e11ad905-14af-4a14-b038-246257aba641/how_do_you_clean_the_filter_on_a_whirlpool_top_load_washer.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/48899547119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5038530e-d75f-42a4-864c-9c170e9f661d/29940851456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2770050a-0dc2-45d3-8ae5-dc3518170591/manijevoxinonexowiralatom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58648e45-1fe7-4915-b707-ff76ad807398/69329076966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86ffde16-7ef4-4d38-bfc0-1dc2ea8c7ec1/sudixexaboxumepebebejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b02a6247-6ccf-4e9e-aace-997b3131d965/bolinenubotobosege.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 5336 bytes
SHA-256: 07dffe14414d0ac56ec7da82dee4b598adf84f0e08663efe5a8009ac8f6a5b15
font_01_sfnt_off00010ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF4 11424 bytes
SHA-256: 0d62fa512345d32fe64b0b09e2fd9d1fe09bc50cc65d0ab542d58fed856a2adc