Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fcf39f5505b0613…

MALICIOUS

PDF

72.5 KB Created: 2021-04-03 09:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2e593419e8eb2e7fabe0cb78e33080c8 SHA-1: d54be24e9c5930f0ace84cd81fea77903a617fcf SHA-256: 8fcf39f5505b0613301865208353c26929807ba03dfbd2abc7c5759e468f7b9c
206 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan. The embedded URLs and the heuristic 'SE_CALLBACK_LURE' suggest the document is designed to trick the user into clicking a link, possibly for a scam or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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/strik?utm_term=bank+5+hours+dartmouth PDF link annotation
    • http://woxuruko.medianewsonline.com/xodewoxobarirezenetuvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_602d3d8d7f08e.pdfIn PDF document text
    • https://cdn.sqhk.co/lunapolakezo/eqhhnNt/2020_kawasaki_ninja_400_dashboard.pdfIn PDF document text
    • https://cdn.sqhk.co/sazipuvaxiv/ifUherP/pretty_girl_shake_it_lyrics.pdfIn PDF document text
    • https://wigapekowuv.weebly.com/uploads/1/3/4/4/134488511/ca912f47269d55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421061/normal_6063a947b306b.pdfIn PDF document text
    • http://tevfikyuce.xyz/how_much_did_greene_king_sell_fory2430.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417318/normal_5fcd4788e9f5d.pdfIn PDF document text
    • http://fakts.design/44175483644hgiio.pdfIn PDF document text
    • https://cdn.sqhk.co/wozepefiga/jhelcPY/age_of_conquest_iv_mod_apk_android.pdfIn PDF document text
    • https://cdn.sqhk.co/bipukawu/jdzVhrp/21922153686.pdfIn PDF document text
    • https://govabegos.weebly.com/uploads/1/3/4/0/134018252/gedibavujeteb.pdfIn PDF document text
    • http://kewatupu.scienceontheweb.net/puxebexavanexuruvet.pdfIn PDF document text
    • http://jefevivavifax.scienceontheweb.net/bewometunamijijegedot.pdfIn PDF document text
    • https://fotobuwab.weebly.com/uploads/1/3/4/3/134368258/nanumax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_eed1ec3a4bc14499be3a9ed10e852e2f.pdf?index=trueIn PDF document text
    • http://bavevex.onlinewebshop.net/zejojo.pdfIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_7f981fab1541422eaecef57d972da7c0.pdf?index=trueIn PDF document text
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_20df3aff24ff4d0a835d1f8edc3833bd.pdf?index=trueIn PDF document text
    • https://d6477b75-8e4d-4453-8bbc-a86a6009e57c.filesusr.com/ugd/261d41_6d42581efdae4b9d8e4299e41213f33b.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_off0000dcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF2 5272 bytes
SHA-256: 29fd193006d55390767b9dc3e1ab1d00993a5e8d4becf296d5b6f096e9a9817f
font_01_sfnt_off0000eeb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB4 11144 bytes
SHA-256: 1a3162a4e493eab00d9510651ce95506041f6a3272b71ed55f2b28e214d12994