Malicious PDF — malware analysis report

Static analysis result for SHA-256 085e54a39fd9bc17…

MALICIOUS

PDF

102.1 KB Created: 2021-04-14 22:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 47f3d910290e428d415c172006ab8f94 SHA-1: eca1e83f8e5a206765712da1e8d20230b3db587d SHA-256: 085e54a39fd9bc17d7c803be90f078b32aa0cdd9aa3a496c7ad5cdf6eead519f
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 0.9998

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://xajibur.ru/strik?utm_term=define+theoretical+framework+in+social+work PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375342/normal_5fd7ab4c6f97c.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://item-get.top/gegelekudq6eg.pdfIn PDF document text
    • http://mon-cmbretagne.best/juzifalepasazef1vt4o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466408/normal_601fcc51df2f3.pdfIn PDF document text
    • http://deemonatrafik.xyz/77467300190s57o1.pdfIn PDF document text
    • http://gladkoe-telo.xyz/bulova_precisionist_watch_reviewe87uy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490542/normal_606cb9b276b2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_601b1a21ccb39.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/ce351b89-590b-4654-a7ff-a50ebb799209/78012661854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42f2ace9-8b5e-4357-8f57-37dcf697bce7/46895166528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57230342-cd65-460e-8d2b-67ee63c14b65/how_much_does_app_development_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2964ea8a-b6fc-4ece-a526-12bfad873e30/aint_i_a_woman_sojourner_truth_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/881945b2-b515-4430-b7d3-b7dcc83aff31/how_to_edit_a_nuance.pdfIn PDF document text
    • https://18bc7be3-897e-46c1-a475-efc190d089bd.filesusr.com/ugd/62845f_84f1ef56cb984acc97f15db411b2c14f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7686a2e4-f293-4c41-a1ce-000451e33fda/512837839.pdfIn PDF document text
    • https://24b051fc-04af-4e2d-8b9e-4e75c06063ec.filesusr.com/ugd/1a488c_1bdb8d21aead43d7a3159a0ba4546dd9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eaac7e5-0dec-49c7-8d4a-2b9d8edea1b7/the_rapid_fat_loss_handbook_a_scientific_approach_to_crash_dieting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91384171-cce1-407d-a6ee-cc66e21d1d72/riwigasavawuxasutufinovem.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_off0001552e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1552E 5276 bytes
SHA-256: 214cb6cbd31951838b430b20c02cafdb76cb4b573911f8922210d8f8ea25a547
font_01_sfnt_off00016711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16711 10572 bytes
SHA-256: 989a7e3e3779db4137004e414b3ab7645826f0ac89ef64215f717f9ff80550db

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