Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1b542422ddd2f0…

MALICIOUS

PDF

94.6 KB Created: 2021-03-28 18:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a24fc18eceb365ce970876c978007061 SHA-1: f449a0100a018b129689af28aca38c8e8de995ae SHA-256: 3c1b542422ddd2f05bebd30904609b54bc4f0185b107c6d135fb53b266af8292
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. Several heuristics, including PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM, confirm this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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://seumenha.ru/strik?utm_term=the+fall+of+the+house+of+usher+audio+francais PDF link annotation
    • https://luvikexixof.weebly.com/uploads/1/3/4/4/134481561/zitifezaxoxopilana.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370533/normal_5fcad83c7cd3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486765/normal_5fedaa5da19c3.pdfIn PDF document text
    • https://patoduwewoz.weebly.com/uploads/1/3/1/4/131483118/xowotekusivenow_nazubiruneki_rutipeligemoz.pdfIn PDF document text
    • https://sujujawajiz.weebly.com/uploads/1/3/5/9/135964945/802bdebd660f.pdfIn PDF document text
    • http://makikupake.iblogger.org/60517270761.pdfIn PDF document text
    • http://tenopokas.22web.org/dewalt_20_volt_max_xr_brushless_drill.pdfIn PDF document text
    • https://pebabole.weebly.com/uploads/1/3/4/6/134698512/mixax.pdfIn PDF document text
    • https://tilotifibow.weebly.com/uploads/1/3/4/5/134505855/bimalojogireb.pdfIn PDF document text
    • https://vosuzupitozom.weebly.com/uploads/1/3/5/3/135313705/191cffc99d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403408/normal_5fec9f163a7cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483604/normal_603774e143619.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461763/normal_5fe02712d7182.pdfIn PDF document text
    • https://boxavukexuzar.weebly.com/uploads/1/3/0/7/130775797/ad314.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_376232ab3ef340fa9f65a0cd35be2dab.pdf?index=trueIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_4e679192b2294d7f9162e5f1393c0f47.pdf?index=trueIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_12261e57b7644d1d9658ba1364a2440c.pdf?index=trueIn PDF document text
    • http://tajafex.rf.gd/nefajutusivagarabugag.pdfIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_07c5cd2fa36d4a3f901006a09c2ccdce.pdf?index=trueIn PDF document text
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_0a343d636c104ab18c6f0ca15567dc71.pdf?index=trueIn PDF document text
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_32751458820c43c081096a1e6fc2df89.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001302e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302E 5060 bytes
SHA-256: 0bd48c9d1981d2f0deb892fff193e4e8b9a35da332dd0ec959f1dcad855ba32f
font_01_sfnt_off00014158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14158 13484 bytes
SHA-256: 06a01b9a1c1d8db78263202b77e8f91ededebe67f52af71ceb3fbeb50ac5550a