Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c6b014bbe82d42…

MALICIOUS

PDF

64.6 KB Created: 2021-01-28 13:35:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 14da51a613d1af6215b85449001998b5 SHA-1: d14a16b5d49ae7f1a69eeb7bd62c2202a38db76c SHA-256: 93c6b014bbe82d42a120c04290c90230e017670bc1acba7d4850478eb20fae23
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with many pointing to disposable hosting and redirector infrastructure, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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/123?utm_term=concept+art+portfolio In PDF document text
    • https://cdn.sqhk.co/dajebala/hegIdhc/carrie_underwood_new_song_drinking_alone_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/fadejiweruw/hhjigjj/68994362090.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367297/normal_5fe4d361adc36.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/saaegft/wijaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472766/normal_5fe90d98b381b.pdfIn PDF document text
    • https://cdn.sqhk.co/visukodo/T0uDhbQ/9658965325.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/fhfgqYV/40355151753.pdfIn PDF document text
    • https://tefojemitadu.weebly.com/uploads/1/3/1/6/131606809/memotasozu.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwozobo/ajNgojh/bijexefajivagogen.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/ggigzib/rizadur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405202/normal_5fffa1a6c410f.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/hgic9wH/kovexatuwilemafutixek.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/bqjfUjf/zudufikefukizasavuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391620/normal_5fcaceffde506.pdfIn PDF document text
    • https://cdn.sqhk.co/lilavokolet/bvNgfYn/twisted_tea_distributor_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/aMhgjgW/rise_up_andra_day_piano_sheet_music_free.pdfIn PDF document text
    • https://tojuxumisadef.weebly.com/uploads/1/3/4/7/134714483/xovukelaxufigetuzuwa.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/b94492221ddfec7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gefetela.epizy.com/lagu_azharina_azhar.pdfIn PDF document text
    • http://veruzixiki.rf.gd/17300113455.pdfIn PDF document text
    • http://daxevekiwenux.epizy.com/tween_machine_maya.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A8 4644 bytes
SHA-256: 823d8f220e8698633f14556d755e0df6f77894a3d80a17870442fe4475de6045
font_01_sfnt_off0000c372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC372 9892 bytes
SHA-256: 1be16f66ff94272ac130d21c5eeacc2d0078e55638dbfc2e9aeb760d31c01d45
font_02_sfnt_off0000e57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333