Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24127af33bd95de…

MALICIOUS

PDF

77.3 KB Created: 2021-04-01 10:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 692e9400132fe6b85c090c190e52d9c8 SHA-1: 25ed405f38f75c1ef77e7ba65f75a6e9c75e9ec8 SHA-256: c24127af33bd95de549e1c9ed2541c69c4d9d00ca0debe29d3eadf68503fe023
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The primary malicious URL identified is https://yafferge.ru/strik. This indicates the document is likely part of a phishing or spam campaign designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=what+does+to+sunset+something+mean In PDF document text
    • https://zememaxuzibur.weebly.com/uploads/1/3/5/3/135326459/didoroliwuniti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479470/normal_5fec94774aff6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375702/normal_601f52d75f2c0.pdfIn PDF document text
    • https://zororoxuz.weebly.com/uploads/1/3/4/3/134309160/cb22c0d2f4125a.pdfIn PDF document text
    • http://supportcopyright.net/baseball_team_uniforms_historyfsfth.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403687/normal_60014ee2c04a4.pdfIn PDF document text
    • http://sodaapp.club/1499614920594ptp.pdfIn PDF document text
    • http://asia.kiwi/fexaxejonoki2937l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463565/normal_605964742bfcb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7137bc97-5050-4296-bab7-93f704d6cd4f/1086451460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c9c8fe1-deec-4695-85ae-e5c5a0f5211d/kjv_study_bible_large_print_leather.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad6d0b91-8472-4f0f-875a-be2e5f3f5ef8/i_am_not_famous_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/76408703056.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/emulator_iphone_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/antabuse_davis_drug_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb3805be-bfbd-46b5-b9ca-31732f22f610/2010_lexus_rx_350_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5ec692d-3de0-4de9-846e-28980cfc895e/zuluwetirawufofote.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 5124 bytes
SHA-256: b7539838606a3c94cf6ad596568ccc69edc27708d1bb7c97e113860956ff8576
font_01_sfnt_off0000feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 12588 bytes
SHA-256: 8b2150c6909184c22795c4f4559d163d156601da30970481dbeb866c17bd9272

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