Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c0e904dfff5799…

MALICIOUS

PDF

70.6 KB Created: 2021-02-18 07:48:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c2ca39c7e309b41795ba232f1358e465 SHA-1: 2985304b6dc8b0e3a73712716a897d46b8b56a48 SHA-256: 91c0e904dfff579915d96981c15b54a94d4520173c6bdd234f3af145699566d8
244 Risk Score

Malware Insights

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

The PDF contains a large number of links to external websites, many of which are hosted on disposable domains or known redirectors, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs are the primary indicators of compromise, likely leading to further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=optiplex+755+processor+support+list In PDF document text
    • https://desotidibig.weebly.com/uploads/1/3/0/7/130775813/cd6f17c0.pdfIn PDF document text
    • http://premiumpornclips.com/43206282645jtafw.pdfIn PDF document text
    • http://mon-fortuneo.best/composition_of_transformations_worksheet_answer_keyac4nk.pdfIn PDF document text
    • http://tuimag.ru/12909136766hbnhg.pdfIn PDF document text
    • http://hookup153.online/wixofoxifugexujinivtld2.pdfIn PDF document text
    • http://cardio-natural.info/58443115896p14vu.pdfIn PDF document text
    • https://talotemeve.weebly.com/uploads/1/3/1/6/131606578/5ec07912a938.pdfIn PDF document text
    • https://sutogibigasoju.weebly.com/uploads/1/3/1/0/131070189/9565010.pdfIn PDF document text
    • https://gidujinogojavu.weebly.com/uploads/1/3/4/0/134096303/ac0aa2ef8a.pdfIn PDF document text
    • http://newser.site/california_motorcycle_handbook608ty.pdfIn PDF document text
    • https://sajozigita.weebly.com/uploads/1/3/0/8/130814351/jejuwibotopatugiza.pdfIn PDF document text
    • http://kepamusujuboza.iblogger.org/tarepupazejuninogitidade.pdfIn PDF document text
    • https://jinugavov.weebly.com/uploads/1/3/4/4/134438703/3265282.pdfIn PDF document text
    • https://mosejibufo.weebly.com/uploads/1/3/4/4/134437632/devavozoz.pdfIn PDF document text
    • http://sojuvofud.22web.org/google_adwords_search_exam_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/g9rab13/33811553356.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fepadegan.epizy.com/gibelasaxagemokewomek.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E6 5016 bytes
SHA-256: 1371b55612e410fc6b5813047b67088f90ea8ad9549b4cf22b63f1e67b4e9e4b
font_01_sfnt_off0000e51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51C 11912 bytes
SHA-256: 347369878236800d917e876c128d1513cbe9c9b18a6842f0f12b7a251ccb8f44

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