Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f7872aed159862…

MALICIOUS

PDF

82.1 KB Created: 2020-12-27 16:56:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6e4fbc27af8b6b6dff6274f54701d813 SHA-1: 4fb750132e26d578ece1a02828b780dc093223b2 SHA-256: 77f7872aed159862182c4ba0056375180ac7796c6982e39bb60d9a6ad8a9bd64
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 by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, indicating a potential link farm or phishing attempt. The document body is heavily obfuscated and appears to contain junk data, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/123?utm_term=stone+mountain+state+park+nc+weather PDF link annotation
    • https://nogenovone.weebly.com/uploads/1/3/4/7/134745979/954216.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492600/normal_5fb887f0213e8.pdfIn PDF document text
    • https://zobezefifoluza.weebly.com/uploads/1/3/5/3/135306737/lurat.pdfIn PDF document text
    • https://fubalaxusagipun.weebly.com/uploads/1/3/4/1/134108832/4851a9e4.pdfIn PDF document text
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/cc94e2f936e8f2c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sezutuma/88010512737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/129fc2e2-3666-47de-8b33-d3daa2bdc193/siberuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e53eed3e-6454-4d89-beae-8a6da1690801/43042663205.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68422846-112d-4c12-a50d-d2cb25ae1f48/losemuwubineride.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/halton_police_report_online.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/caterpillar_3516c_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4752b3bd-d1c4-478d-9849-dcc3be76eeb8/64063380598.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 5400 bytes
SHA-256: 36ab2d158138d816902fcecd5fed308a1fb3211a6765a7498a8fcd36c4500373
font_01_sfnt_off00010a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A73 2744 bytes
SHA-256: c58734b7c43f876d00250fe79027c28030c899bcb97b97a165465ed91b27eb93
font_02_sfnt_off0001161d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161D 10988 bytes
SHA-256: 71c795f32a1859a7b04bc036d8e873a7f579c0e7433157d0291b22212b3094e4

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