Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1721813c1769a9b…

MALICIOUS

PDF

75.0 KB Created: 2021-01-17 15:40:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e4092fd5befb557dc3ec3d778d85a9e9 SHA-1: d0845658e4683d682e415a35667f130494727ff4 SHA-256: e1721813c1769a9ba3c8c04ed1d825364b821e6309323c4aca30011a5e69a55a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for redirection or exploitation.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=pale+blue+dot+carl+sagan+pdf+free PDF link annotation
    • https://cdn.sqhk.co/sebixodof/jigjiat/world_of_warcraft_original_game_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/ggiheji/green_papaya_fort_smith_phone_number.pdfIn PDF document text
    • https://site-1177347.mozfiles.com/files/1177347/horror_escapes_la_review.pdfIn PDF document text
    • https://fewaxozane.weebly.com/uploads/1/3/4/3/134341296/833338.pdfIn PDF document text
    • https://site-1215606.mozfiles.com/files/1215606/vokuzolurinati.pdfIn PDF document text
    • https://kusovagojevo.weebly.com/uploads/1/3/4/8/134883394/nixuje_rubadepe.pdfIn PDF document text
    • https://wimupajano.weebly.com/uploads/1/3/4/6/134682998/8654636.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/39agfhe/wixowigolevu.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/jgezif5/61059360721.pdfIn PDF document text
    • https://site-1229162.mozfiles.com/files/1229162/54602745973.pdfIn PDF document text
    • https://site-1206084.mozfiles.com/files/1206084/ajatashatru_odia_full_movie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sudiwoke.epizy.com/financial_management_excel_spreadsheet.pdfIn PDF document text
    • http://sirowozikuko.epizy.com/37776609457.pdfIn PDF document text
    • http://jiwenufaxo.epizy.com/28902817334.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_off0000e868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 5464 bytes
SHA-256: f0b90164562ddc2e3c511bf20b0fc9df51ba841bdfe7c5d268a8b9aac8dfaba1
font_01_sfnt_off0000fb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB08 10584 bytes
SHA-256: e6ee75a24e3f61f3ecfe95309cdec9997a9ec2a30a3ed6b531752291b594051a

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