Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d053062be1b406…

MALICIOUS

PDF

70.7 KB Created: 2020-11-27 09:08:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1ec956dba9785d5a6cc371418f4a8c5e SHA-1: dc56132b2f7942e11205acb8d80ddaa754e10c66 SHA-256: 77d053062be1b406b1b4fe77172b3bb204a03c93a4760cb4ea01be0e75e11a44
176 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. It uses a callback-phone (TOAD) lure. 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffnew.ru/123?utm_term=xcel+energy+center+bus+parking PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377662/normal_5f8ed061ea8bc.pdfIn PDF document text
    • https://kasukironumasex.weebly.com/uploads/1/3/1/4/131454791/javotedel-wibuweja-jufutimofekeliv-xaleb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417049/normal_5fadde14ec37a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372376/normal_5f9f749aed0b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462096/normal_5fc072ecee07c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389801/normal_5f9011ab3dd5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393486/normal_5fa87aac4c0fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487413/normal_5fb25ce6be507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427504/normal_5fa7bef51c68f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377095/normal_5f8b104da7a46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491945/normal_5fb02dcd4c3cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388183/normal_5fad45e1e6a73.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
    • https://s3.amazonaws.com/tokatefozude/xemaku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b81963c-b546-4a5d-b17f-6c22f0960387/cub_scout_pack_meeting_agenda_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/39013214613.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b531450-0151-4766-9991-9bceeaa731a9/67738919457.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_off0000c9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C7 5156 bytes
SHA-256: 7d4a171cf526d87303fe167c81bc3858ccf627728bac144165dce4922c58499d
font_01_sfnt_off0000db5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5C 10832 bytes
SHA-256: bbd5833670c596e5e92cd5749520a907ffac8f98a6deea620442cc86131ba48b
font_02_sfnt_off0000ffc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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