Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca922809f5c4289…

MALICIOUS

PDF

75.5 KB Created: 2021-05-03 20:40:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5cabb7e8adaf9d3fd9886641a67eb958 SHA-1: 30084a266f7c9bee38a3ce5d62a0b3f087269e14 SHA-256: 6ca922809f5c4289ea0a713fc08875bc3d482cbc19d20aff45c525a1531663ba
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-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://kuzutuzo.ru/strik?utm_term=survival+of+the+fittest+mobb+deep PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466166/normal_601013fc29ffa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491169/normal_5fe4e436900d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_5fd33128a83bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482869/normal_6036c41a1910d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427529/normal_601b8de787cd6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458421/normal_5ff273beae785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369911/normal_602a34a9410d2.pdfIn PDF document text
    • http://xajozixav.iblogger.org/astrill_china_link.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rujemivegelap.epizy.com/charoen_pokphand_group_annual_report_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0e9a497-8861-40d8-9917-eab83c238517/crochet_baby_blanket_patterns_using_super_bulky_yarn.pdfIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_df48ccb81ae04f7ab42661bfaae49c8f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9f9eb32-36c9-47c0-87c8-fde22f2c514c/vampire_the_masquerade_5th_edition_core_book_download_free.pdfIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_dfb076896e5e4a34b61a131cf9f614c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/coleman_roadtrip_lxe_grill_parts.pdfIn PDF document text
    • http://vuzudaru.epizy.com/8573576110.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/wujuxatiwiwes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/294d8474-ae13-47c2-aefb-74b2cb808aaf/garmin_vivo_3_music_battery_life.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/barnett_vortex_compound_bow_review.pdfIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_0db85162fb8a4c89889d331c1db7de31.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/vuwifaboxebonukejuteti.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_off0000e429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 5584 bytes
SHA-256: f2dad17c735de6c23eb596966620cfb5f329025cf1ad646d337ece0fb41a599c
font_01_sfnt_off0000f6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 12328 bytes
SHA-256: 9c80f6ce690e3379d341e05556b6a4481b7a1e5bb8446959790efc05c32d6e0a

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