Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78010e21805dc95…

MALICIOUS

PDF

80.9 KB Created: 2021-02-18 02:01:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a459e9b381b8b4b9e49a1a5accff3cb8 SHA-1: dbb27f61bdfbcb8e246e51982798d8662ef07cd1 SHA-256: d78010e21805dc959004e4a0b1be19006d2b07a63225e5df20ffa595c4bd4cdf
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://jottigo.ru/strik?utm_term=how+much+can+you+pawn+your+title+for PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424010/normal_6023106757dcf.pdfIn PDF document text
    • https://bevotiwi.weebly.com/uploads/1/3/1/4/131437753/jusifefijazor_pisekojibulisod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481162/normal_5fdf9507a1616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421200/normal_6014e15c97ff2.pdfIn PDF document text
    • http://grizhoff.ru/75584515027yuunn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371013/normal_5fe6a9708f64f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380405/normal_5fdbac3cc4b71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468294/normal_5fe79938444f7.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/gadumagabusodel/jojenikanonovidob.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/wodunuwofizigutibok.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/jidalafonokebaxat.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/chrome_windows_7_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/australian_resume_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/bloons_td_6_tower_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/fuwowutafixilijikiwadovam.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_off0000f28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 5112 bytes
SHA-256: fb66ec873b4aa72c2ad1586bd84011d0be581b9789ee3e956f4b4322e9fe754a
font_01_sfnt_off000103de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 10668 bytes
SHA-256: 43aa8cc37332fde2263e94bfcb2425b036ce61e99f409f968d82b8d22d6f68e4
font_02_sfnt_off00012861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12861 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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