Malicious PDF — malware analysis report

Static analysis result for SHA-256 f412b03c235161bf…

MALICIOUS

PDF

70.2 KB Created: 2020-11-25 23:03:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 33ebaf9f0197f5da59c6d2d7ba6813c2 SHA-1: 9377f1125ffb24a78ebbfa5371776d2a106df075 SHA-256: f412b03c235161bf22dbc715a1588082bd7ec63a18d1c488f213a0e59048e370
156 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 5

  • 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.
  • 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://trafffi.ru/aws?utm_term=balancing+chemical+equations+worksheet+ii PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415322/normal_5fbb93ca6885e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425230/normal_5fb9baa8cabba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370280/normal_5f8af8ce763d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450244/normal_5f9fe35c530a7.pdfIn PDF document text
    • https://jasazifo.weebly.com/uploads/1/3/1/4/131437377/8c70708429b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_5f8d6b6647253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388629/normal_5faf4492b4d55.pdfIn PDF document text
    • https://xekixudag.weebly.com/uploads/1/3/4/3/134336078/632817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424630/normal_5fae3d2763adc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383930/normal_5f8dbb845346d.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/damevusom/calisthenics_workout_free.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/how_to_make_a_poppet_doll.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/handicap_placard_pay_meters.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/10479339511.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_off0000c7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DB 5428 bytes
SHA-256: 8e30a893fb1fffaf5b21b0963e79e0fb7ac0791266a3d4ef09f7cd9d2a9353c0
font_01_sfnt_off0000da29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 10452 bytes
SHA-256: 99dec48c18789e1561600bf273670e8546bd31a4636cd5eb12ac152100f1b9b1
font_02_sfnt_off0000fded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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