Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03e6629f6ab7a35…

MALICIOUS

PDF

83.2 KB Created: 2021-04-28 15:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4b7a7540c6b3fb1179a284a9467063e3 SHA-1: 875ae12e05d5181ea596bb7d005317a5016720f8 SHA-256: a03e6629f6ab7a3548d145b961aa0791d01b0825de6bfb14bbeb968b5d71bb77
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://leonvi.ru/strik?utm_term=what+batteries+does+ingenuity+bouncer+take PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369653/normal_604b627ea5492.pdfIn PDF document text
    • https://xukonixivuki.weebly.com/uploads/1/3/0/9/130969652/375d0b27bc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485301/normal_5fcdbc7d54eee.pdfIn PDF document text
    • https://rurujopolobadez.weebly.com/uploads/1/3/4/4/134444805/3728381.pdfIn PDF document text
    • https://vonorakukipi.weebly.com/uploads/1/3/4/7/134721252/tixujefu-givesazanidob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368782/normal_5fc8148ac1703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455660/normal_602c8ad85f2b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529697/normal_5fdb7238dd7e2.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/e7211561-3824-4780-9894-3ebd34e138ff/principles_of_genetics_7th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/pefir.pdfIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_bf69052e02ef4c3b871f9a65169edbaa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/15496263366.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/67934914324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0592afb7-233b-46f2-901f-4bf326810985/29881194337.pdfIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_7bd7fcde6aa94f1ebd018cf9b0efce35.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae90d6b2-8063-4663-bd2d-ebfc9779a79a/17874140122.pdfIn PDF document text
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_99ab6388b57e4f0993f367df8d934aee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e431d0-e435-4ec7-bf7e-6e6e90a940d9/the_wave_radio_live_stream.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_off0001062d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062D 5488 bytes
SHA-256: e2a2d417d9ac3e54b55b31607a4307acd83981f71e94e112bd6c0c4ca9a97faf
font_01_sfnt_off000118e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E5 11160 bytes
SHA-256: e6c5415e3d0ec89883ce2dde862d19f17bbad422a6f1abe23927ce7c21a7870a

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