Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0cecff4d8c713e5…

MALICIOUS

PDF

80.2 KB Created: 2021-04-04 05:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2322dd9095e65438af65aca9335ddd6e SHA-1: a14187952313edd01d2e23713f9fca106f92ac6c SHA-256: a0cecff4d8c713e5c1a80cea1751adf73fe8b7364cc8f3ffece33f224d4e3712
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external URLs pointing to various hosting services. The presence of a large number of links, many on disposable or dynamically generated domains, strongly suggests an attempt to distribute malicious content or conduct phishing operations. The ML classifier and ClamAV detection further support the malicious nature of this file.

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://fokemale.ru/wix?keyword=biomesina+compuesta+para+q+sirve PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490252/normal_60125f0d49ad9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414334/normal_5fe0fd8f93a6e.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/2953991.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443357/normal_604b55f287b21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472788/normal_60633e3b02d8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417145/normal_603cc7ac23216.pdfIn PDF document text
    • https://bitilidejiv.weebly.com/uploads/1/3/4/4/134442737/95079de90758c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_6015a2cd87c63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457318/normal_60363818b8879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463812/normal_602ef22f3af10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404959/normal_5ffd1fe7e488d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_80a17bc88ded4671b8ac38708f7ee5a2.pdf?index=trueIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_1568a663a8b84f239fd99313b066992c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/db96359b-f74d-4c8c-9d12-1e825d4c4b49/psychoeducational_group_topics_for_substance_abuse.pdfIn PDF document text
    • https://3b9c8e93-52ab-41e8-96f8-e5fc639bf6fa.filesusr.com/ugd/fe3ccd_31ee0ed3656547b7b93c4b2629c9b43b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b70819e3-688e-42d8-92a4-51e6a75215c8/does_stephen_king_appear_in_pet_sematary_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afd6c0ae-b3e6-4809-ba70-4092b55b55a7/pewemunexawajulefilam.pdfIn PDF document text
    • https://d397443b-80d0-4e74-967c-4ce830ee3754.filesusr.com/ugd/0a76f0_8da3364dab924cd28650292c912bf873.pdf?index=trueIn PDF document text
    • https://eda93683-a6ca-45e9-8056-ca7adea7f1dc.filesusr.com/ugd/d655db_98f539d4a5984f4ab7dc43ecd4fb3589.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3bbbe1d-8a93-4f26-bac1-7edcaa6904e3/nancy_drew_movie_2007.pdfIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_2f7ccaf14954463eba76a1e7e98fd9d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/34d57f96-33d2-4baf-a65a-214ff7a2cb2d/jafuroxiwuke.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_off0000f89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 5284 bytes
SHA-256: 5f0d3f80bbb57fbb13b5204ed79f006c0633d933f25c7da13e2027cc9625f3a4
font_01_sfnt_off00010a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A88 11920 bytes
SHA-256: 58ffb5c16f02e6cd66d53891df725f6892505297c8f74ee1eb5d1c2b258a7401