Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a049e1592cd405…

MALICIOUS

PDF

83.9 KB Created: 2021-02-23 04:18:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1e3d51e69cb6373bdbe8af9289a40376 SHA-1: ec6c80d685bec77fdbc7cacbdf83983d4c39042e SHA-256: f2a049e1592cd405cff1aeac6c832f4bce33a0cde27d5faeb917c1f3c204142b
186 Risk Score

Malware Insights

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

The PDF document was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the link farm and the PDF's structure strongly indicate an intent to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/aws?utm_term=white+tiger+look+meaning PDF link annotation
    • https://tufubigin.weebly.com/uploads/1/3/1/4/131453284/pujolodumogiv.pdfIn PDF document text
    • https://jiwepeduvebata.weebly.com/uploads/1/3/1/4/131456267/wukegexu_xemolowepusis.pdfIn PDF document text
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/vagekufebon.pdfIn PDF document text
    • https://vubeluzuge.weebly.com/uploads/1/3/4/3/134357782/2764344.pdfIn PDF document text
    • https://fuvekusegubo.weebly.com/uploads/1/3/4/7/134736786/vubunuka.pdfIn PDF document text
    • https://dagagiketilijo.weebly.com/uploads/1/3/4/3/134312633/tofikulubanig.pdfIn PDF document text
    • https://pupifino.weebly.com/uploads/1/3/0/7/130776741/ruseji.pdfIn PDF document text
    • https://xogovowumo.weebly.com/uploads/1/3/0/7/130738979/15110.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://likijanima.epizy.com/vitogototimufilelegefib.pdfIn PDF document text
    • http://razogop.epizy.com/bilinear_forms_linear_operators.pdfIn PDF document text
    • http://gubadix.epizy.com/garmin_g650_tutorial.pdfIn PDF document text
    • http://wunikuwikefa.epizy.com/86448927480.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_off00010907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10907 4996 bytes
SHA-256: cfee0389159493b7f1c20d5c18d83c5f6113e8a4a8e67a0c0b6fa59d3831fb32
font_01_sfnt_off000119e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E8 11800 bytes
SHA-256: ed7f666c40c3dbd05edda8e2bce92bb742c59177ff25293bcb89b8fe19360b1a

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