Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb544c944c6ea569…

MALICIOUS

PDF

75.3 KB Created: 2021-03-24 18:32:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d16c3fb61fee5e31bc4d1a6c863ba2b2 SHA-1: 542c4482d5d39920f06bad240fefff65a2813eb5 SHA-256: eb544c944c6ea569e757aefaede75dd607205e2b438423b781be37497e507233
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://crophysi.ru/wix?keyword=society+for+neuroscience+2020 PDF link annotation
    • http://axecheat7.xyz/coffee_roasting_guide_book6cci0.pdfIn PDF document text
    • https://cdn.sqhk.co/mupalewefe/8zgt5hh/easy_medium_and_hard_riddles_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/gegjzfN/lol_s9_world_championship_schedule.pdfIn PDF document text
    • https://cdn.sqhk.co/nutakurij/KImyVgi/drag_racing_top_speed_supercarrier.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/jX1ifjf/naxeex_superhero_mod_apk_mod_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/menaleser/njdgggd/76488498425.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvuvidova/MjcuheM/find_objects_game_app.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/fLZqgjq/difatiku.pdfIn PDF document text
    • https://cdn.sqhk.co/fewesiwe/d3kDr5D/51533678119.pdfIn PDF document text
    • http://qwonder.space/siwudipederovijekg2w5.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/c9jiihN/snake_eyes_1998_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/bhalnid/29048921625.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxukulalodi/CgejheV/masha_and_the_bear_birthday_dress.pdfIn PDF document text
    • https://cdn.sqhk.co/wofetewa/jd2hhgi/robonamitulaxuvubopewigu.pdfIn PDF document text
    • http://pop-marketplace.ru/mekiwokepadi642e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4a5bfc55-71df-4474-8f3e-9f6aca65c64b.filesusr.com/ugd/29b6ce_1019baa098f749989b3b74e489a9c02e.pdf?index=trueIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_b2dfb9d8b06543c198db4cf66751e5c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de7e7426-9450-424e-b6a4-a809fd790776/datojufixosu.pdfIn PDF document text
    • https://63150c49-9e7f-4923-bc7a-1e4049050ce6.filesusr.com/ugd/cba449_5d08f3e22cf54bf4a751b17eea81ec7c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/48a135e9-d844-4bad-9729-351205289287/maschine_mikro_2_tutorial.pdfIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_6695331402f942a0b9946f714b9e0deb.pdf?index=trueIn 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_off0000e99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 5112 bytes
SHA-256: 7d033c9c31a7b09ace46953460bc71ffd8031989bdb29eddfca4e40ff2b07218
font_01_sfnt_off0000fb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 10704 bytes
SHA-256: c84dedd91be2b1221b72d14f9a1e69d2881bdb37d6e476d0bbb3fb0a985300d9

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