Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfbcf3af9ed20f7…

MALICIOUS

PDF

76.1 KB Created: 2021-02-21 10:20:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8199447ac2b35ee4196252cc509beb7d SHA-1: 2132f4577599df3ecb749ee026ab0e3b4920b960 SHA-256: cdfbcf3af9ed20f7bcfdff7f4e57c02c8d447647f91c40e4a83c0ed587bd61bd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged as malicious by an ML classifier and contains a large number of external links, suggesting a link farm or SEO poisoning attempt. The presence of a 'download' button lure further supports a malicious intent to trick users into downloading potentially harmful files. While no scripts were directly extracted, the structure and numerous external URLs indicate a likely attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=brother+mfc+7860dw+scanning+software+download PDF link annotation
    • https://cdn.sqhk.co/lirotigi/b9WPia9/tarinabixuzafeka.pdfIn PDF document text
    • https://numuzobiw.weebly.com/uploads/1/3/4/5/134589566/06b97e0dcc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454052/normal_6031cd248e5ed.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/qhiibji/riruzemujexupuvuda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371788/normal_6008e5557be88.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/fLldiz2/49913607712.pdfIn PDF document text
    • https://cdn.sqhk.co/kizusuvut/cLH9Zib/smart_watch_pulse_oximeter_accuracy.pdfIn PDF document text
    • https://jejonogukoji.weebly.com/uploads/1/3/4/8/134864124/vejubidexifiseris.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxobenona/fmibxI2/1641758154.pdfIn PDF document text
    • http://4gusevshop.space/ratalusowomazisetirisj2w1k.pdfIn PDF document text
    • https://cdn.sqhk.co/wafixagi/gghifhb/patezonis.pdfIn PDF document text
    • https://fikejibin.weebly.com/uploads/1/3/4/3/134331262/nafefusudefiw.pdfIn PDF document text
    • http://yblda.fun/mawexan5245d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475209/normal_5ffc557e36ce3.pdfIn PDF document text
    • http://sweetygirl.club/wumibepuxakezopafiribawcnnlk.pdfIn PDF document text
    • https://tomutoremaduv.weebly.com/uploads/1/3/1/3/131398477/1864344.pdfIn PDF document text
    • https://cdn.sqhk.co/vedasukuki/iSruie0/puzajopepazo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392237/normal_6022d17f227fd.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/NkPhflZ/metropcs_number_to_pay_phone_bill.pdfIn PDF document text
    • http://allfreebets.ru/butterfingers_1._2_milligrams_albumq6yq9.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/jqA4hbh/48375721863.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE479 6144 bytes
SHA-256: 0acd8f42644808ccb3a5239539afd5d5ecf6f1b3590ac164b75851a7429bd7d5
font_01_sfnt_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 14324 bytes
SHA-256: 14449e8ec8c6bd69c07943588bf016e8cf492c4448c86a0db233fef35b986022

Open this report in the interactive analyzer, or submit your own file for analysis.