Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c7d79c8a2bd6e3…

MALICIOUS

PDF

74.3 KB Created: 2020-12-27 11:35:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b0b35e5450b399c6e4c426ecde370915 SHA-1: 96668cfe190f4fe6da8300a52863310078a05ef8 SHA-256: e6c7d79c8a2bd6e305f01a0331f5310a232ea83efee2e23f752a6fa849b0628e
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a technique often used in link farms to manipulate search engine rankings or to direct users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it is designed to redirect users to potentially harmful content.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafffe.ru/aws?utm_term=buderus+gb072+service+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379369/normal_5f97194677e1c.pdfIn PDF document text
    • https://xuvasilibozin.weebly.com/uploads/1/3/5/3/135335949/3344668.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_5f8fb31993e3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423427/normal_5f98ccbe19f06.pdfIn PDF document text
    • https://zosonokabawim.weebly.com/uploads/1/3/4/3/134316026/gipibavak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419451/normal_5faa7cfda6d96.pdfIn PDF document text
    • https://sunajekivogemaz.weebly.com/uploads/1/3/4/8/134895881/2182678.pdfIn PDF document text
    • https://losasogewago.weebly.com/uploads/1/3/1/4/131437886/dowaxalo-tosuvela.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/f1ef7374-6e34-444f-97c3-a3cfb6bc4067/knit_front_and_back_of_next_stitch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d4661f0-d088-42d5-ae5e-2c088315aba0/47162455729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f61fd432-4232-40e2-b41b-a3ef57f465f8/vizio_sb4251w-_b4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfdbb62e-4363-47a9-9f4b-272abcaff0f4/wands_mod_1._11._20.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca992e63-9a8a-4e1c-b8c7-ab027eab4970/sleep_aid_cvs_brand_side_effects.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_off0000e650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE650 5860 bytes
SHA-256: 829dc51517a0bcc1df150081362f0a4d4e8625a5010baef9d5615718716cce6c
font_01_sfnt_off0000fa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 10044 bytes
SHA-256: 8337780208647bb341aef9d615868f5b6496ea02e421e096ef55066d01f717df

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