Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9f0b60c2b1e107…

MALICIOUS

PDF

89.1 KB Created: 2021-04-08 10:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9e97b71d65a07944dec243618af1600d SHA-1: 21888dcd954d5e046d10e475453dd6bd2e5ade57 SHA-256: 4f9f0b60c2b1e1073cb379ea39c711f838aa80af60a10fd93873474209aab90c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links pointing to disposable domains, a technique often used for SEO manipulation or to distribute malicious payloads. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly indicate this behavior. The ML classifier and ClamAV detection further support the malicious nature of this file, suggesting it's part of a phishing or malware distribution scheme.

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://pelibifir.ru/wix?keyword=joshi+puroresu+reddit PDF link annotation
    • http://zumewidife.mygamesonline.org/aun_qa_self_assessment_report.pdfIn PDF document text
    • https://cdn.sqhk.co/wadalibituge/YDUlkic/lepudakogiru.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/gi1U3Uv/zolefepo.pdfIn PDF document text
    • http://bikelumonekodex.mygamesonline.org/vovojewenegurovikana.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamozomeb/cgeCMzD/nfl_news_and_rumors_cowboys.pdfIn PDF document text
    • http://moneyindia.site/81412137636zde5v.pdfIn PDF document text
    • https://cdn.sqhk.co/wujugojuse/jc2hh4m/16912144274.pdfIn PDF document text
    • http://popisazono.getenjoyment.net/ielts_speaking_part_1_questions.pdfIn PDF document text
    • http://verifybadgehelp.com/69971194507pzvl9.pdfIn PDF document text
    • https://cdn.sqhk.co/difejekexe/qnONigo/86489467876.pdfIn PDF document text
    • http://miwasigal.mywebcommunity.org/is_being_flushed_a_sign_of_labour.pdfIn PDF document text
    • https://rowemuvirota.weebly.com/uploads/1/3/6/0/136089617/3769d4e186655da.pdfIn PDF document text
    • https://cdn.sqhk.co/pofaxexaxi/ggqihjb/2065538437.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/jegunonitew.pdfIn PDF document text
    • https://wogalipa.weebly.com/uploads/1/3/4/3/134316604/b38a32aa07ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0ddd2631-58c7-464c-86d0-a5d1d8121c04.filesusr.com/ugd/301b85_107b682691b64772966affdec1bb7c4f.pdf?index=trueIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_42a70ab9b58e4d45b57778b2a42734c6.pdf?index=trueIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_8bc68c24d35446bcb858190f01d78c46.pdf?index=trueIn PDF document text
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_3d44c56f61ff418fb7c22c22f6c4e957.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A8 3792 bytes
SHA-256: 68ceaa4298a67d716638ecea6e8b8c07eaa8ad60730fffe624a83dfb918c10fc
font_01_sfnt_off00012041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12041 4792 bytes
SHA-256: 2f7d82f2830d1ba57ef4ba5c371a62e0a352775c11101a50b03934c12486da03
font_02_sfnt_off00013085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13085 11136 bytes
SHA-256: 74feeca40dfc3a918fb39d0e264d62b6ff9ab6bd3da186e3b9df7d752d3ee388

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