Malicious PDF — malware analysis report

Static analysis result for SHA-256 5191069c492e3948…

MALICIOUS

PDF

82.0 KB Created: 2021-03-20 01:07:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: f1148358cf6f15b147db81649e1d0a8e SHA-1: ab7983d0091bd727490878f210e6579ff2cad8ad SHA-256: 5191069c492e394839d2348ae6b22cffecb2a86c9d607fb78218b74d02de992a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. Many of these links point to disposable hosting, suggesting a malicious intent such as SEO manipulation or distributing further malicious content. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://static.s123-cdn-static.com/uploads/4373519/normal_60083c793e4e5.pdf In PDF document text
    • http://flylovel.com/359554895681yb39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491687/normal_6048d4ade4df7.pdfIn PDF document text
    • http://trysucre.pro/which_olympus_cameras_have_focus_stackinge8y88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447447/normal_60476f620f6db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444882/normal_60263f02bd646.pdfIn PDF document text
    • http://onlinekartiadesi.com/skype_for_business_server_2015_trialgcd9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416322/normal_601763a4948ce.pdfIn PDF document text
    • http://itfamily.info/nfl_2015_schedule_excel_2019kua23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462730/normal_5fe78b8f4970d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495037/normal_600bb98bba321.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/kMuynZNWtA0/wb?keyword=emily%20of%20new%20moon%20book%20coverPDF link annotation
    • https://uploads.strikinglycdn.com/files/b5431484-26c5-499c-8a2f-43cd71b429fa/71667804337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9afc53f-4a2d-482c-814a-635cbbfdfbcf/behavioral_neuroscience_8th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9ac4d79-c97b-46ce-a23d-3aba1c904ed5/attack_on_titan_characters.pdfIn PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_5215e0d234e34defb4d0e3602781db0c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/45c68bd0-0148-4406-8bd9-b0ab64ce8321/verip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/428f1229-0e19-410f-b413-04bce995fd98/what_are_the_countable_and_uncountable_nouns.pdfIn PDF document text
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_0d8bd10c3851470ca760f75ef38efcb2.pdf?index=trueIn PDF document text
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_ca26e50e547d46a1bd2442d7c8af50a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b18e5d90-e2a3-4850-9a05-2485fa8baf46/32686467566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/415755e3-1541-45cd-ac08-35817edb8386/94922798785.pdfIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_dd5dc05d1da64751b42c6663e5e45f95.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e64f1759-3a14-4538-8e8c-9b0f0f0a177c/51291258491.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 4760 bytes
SHA-256: c49912197062c914fb697e723ee6437e71b09c91f491bac70caa623e3067671e
font_01_sfnt_off0001096c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096C 10256 bytes
SHA-256: 23d3c2acc49e82e7b15a46b5d32139ba1fd592635a98413dbbae46ab1f51ec5a
font_02_sfnt_off00012c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C55 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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