Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ce314a88ece3d6…

MALICIOUS

PDF

61.9 KB Created: 2021-01-06 00:58:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 96d484e6a2d5e629c5eea66e290eb00d SHA-1: 9b94b40a5ed4235741b8eeacff4d620ee9c317c5 SHA-256: 70ce314a88ece3d682e84f162cacc11ff73cc88db26540f0fedd183cb664f480
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware delivery attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL that appears to be part of a link farm designed to attract traffic, likely for phishing purposes. The presence of numerous external links, many pointing to PDFs, suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=bill+nye+earthquakes+worksheet+answers PDF link annotation
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/wovap-gepireg-sesoveno.pdfIn PDF document text
    • https://cdn.sqhk.co/lewuravasu/jjn2jc2/te_te_2_crafting_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafaveju/a7C60hb/pro_combat_boxing_gloves_review.pdfIn PDF document text
    • https://cdn.sqhk.co/mawedabe/jgihbWF/zarifagufumogafoti.pdfIn PDF document text
    • https://jaweditulopo.weebly.com/uploads/1/3/4/3/134313576/wotinoxipafolarosew.pdfIn PDF document text
    • https://lopinelu.weebly.com/uploads/1/3/4/3/134369173/c5a9f6a15441.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/a2e43520-0907-4c63-9286-f0d70a412423/35337226407.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/xufuwedadetirek.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/crusader_kings_2_guide_money.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/63528029492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/243de2d3-602c-43c0-af48-19d7fc78343f/bejusewarupufuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9b6e9a6-76b9-4d37-87bc-3dd3a05ca3ba/50785396775.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/60676403441.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_off0000b7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D0 5204 bytes
SHA-256: 024033bec8f89cfc1c945f580a349143a74ba921f19d846c57b9a028edaa8549
font_01_sfnt_off0000c996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC996 9744 bytes
SHA-256: b700e68d9154410591e7758dc031a7d4433d1d35fcc0c49500ffcc3ae750d999

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