Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ddcfdfdf5c20ed5…

MALICIOUS

PDF

81.1 KB Created: 2021-06-01 15:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 01f557f97455ad1123a795c82f47fed8 SHA-1: 2306fbb55d07eb1a3ebcdcf73344b7ce4d713d30 SHA-256: 4ddcfdfdf5c20ed58953fa92628b8aecdfca54b41cbe4f05852a0bffd9616f88
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or distribute further malware. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/pbw?utm_term=proceso+de+elaboraci%25C3%25B3n+de+una+investigaci%25C3%25B3n+documental PDF link annotation
    • https://zifosugelupoz.weebly.com/uploads/1/3/4/6/134693972/tituropirowadi.pdfIn PDF document text
    • https://manukigobedor.weebly.com/uploads/1/3/4/4/134481395/2267978.pdfIn PDF document text
    • https://takaranedo.weebly.com/uploads/1/3/4/0/134017801/8302813.pdfIn PDF document text
    • https://xavexipaw.weebly.com/uploads/1/3/1/6/131636683/526390.pdfIn PDF document text
    • https://jaxedafotonomut.weebly.com/uploads/1/3/4/8/134885779/fimumudimom_pofaripol_xupavaza.pdfIn PDF document text
    • https://vogifidawavuda.weebly.com/uploads/1/3/1/6/131636702/8b2f0a3bb50b.pdfIn PDF document text
    • https://fekanefitogi.weebly.com/uploads/1/3/4/3/134340372/f62e1ac922.pdfIn PDF document text
    • https://fusewire.weebly.com/uploads/1/3/0/7/130776481/9691041.pdfIn PDF document text
    • https://silukijexopul.weebly.com/uploads/1/3/4/8/134868047/3910123.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381105/normal_5fc632cb58b9b.pdfIn PDF document text
    • https://bagekitavaseb.weebly.com/uploads/1/3/1/0/131070055/890002d264b41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418764/normal_60225d98d3175.pdfIn PDF document text
    • https://kozezivu.weebly.com/uploads/1/3/4/4/134444222/nixobegazalelu.pdfIn PDF document text
    • https://kipokemob.weebly.com/uploads/1/3/0/7/130738996/gupovorosazobuw.pdfIn PDF document text
    • https://bopazexujow.weebly.com/uploads/1/3/4/8/134876268/5044725.pdfIn PDF document text
    • https://nubipudovolena.weebly.com/uploads/1/3/4/0/134012318/5689e4c8fd2a1.pdfIn PDF document text
    • https://nugusogo.weebly.com/uploads/1/3/4/3/134319441/4352741.pdfIn PDF document text
    • https://guxafosiwu.weebly.com/uploads/1/3/1/4/131453681/salenesakamu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xutosop.pbworks.com/w/file/fetch/144459516/financial_statement_analysis_and_security_valuation_stephen_h._penman_mcgraw_hill.pdfIn PDF document text
    • http://wuwazilizos.pbworks.com/w/file/fetch/144424473/fenuvovapulo.pdfIn PDF document text
    • http://bekivuxuga.pbworks.com/f/22273944312.pdfIn PDF document text
    • http://pezeliv.pbworks.com/w/file/fetch/144426207/obeb_okek_soru_zm.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_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 5596 bytes
SHA-256: aa0c0c8b29836196185cfeef5ba8b48b46cea0196296b0cb708253229ae12558
font_01_sfnt_off00010ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDF 12156 bytes
SHA-256: b568cc489c9d79efa3f6f23d0086d7a3c911b41467988515f522c6221fba275f