Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e3adce24686fbb…

MALICIOUS

PDF

74.7 KB Created: 2021-03-14 02:19:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 009188ca95a8211b750a3135f823ce36 SHA-1: ab76557589b6d2b62bd239aa1412a1a66128900e SHA-256: f3e3adce24686fbb1891b53acf7220febacaea7bc2cdb5c373cc9149430e96be
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or engage in phishing. The document's content is obfuscated and appears to be a lure, possibly related to product manuals, to encourage users to click on the embedded malicious links.

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
  • 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://vilenefex.ru/wix?keyword=proform+525+si+treadmill+manual PDF link annotation
    • https://xajakubadom.weebly.com/uploads/1/3/0/8/130874473/bepitasubikidelo.pdfIn PDF document text
    • https://cdn.sqhk.co/mobubivifa/djcbji1/ghg_clockwise_login.pdfIn PDF document text
    • https://divuvefa.weebly.com/uploads/1/3/4/7/134759037/576590.pdfIn PDF document text
    • https://jebezefekoju.weebly.com/uploads/1/3/4/7/134737834/wewiwotilivu-sibati.pdfIn PDF document text
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/vijejifotew_sozixuxefemesoz.pdfIn PDF document text
    • https://cdn.sqhk.co/fadanade/ghQ5eih/expedition_meaning_in_urdu.pdfIn PDF document text
    • http://dvestideyli.xyz/invitation_to_the_life_span_3rd_editionc4hod.pdfIn PDF document text
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/431572.pdfIn PDF document text
    • http://hot-money.fun/xonusu5ep85.pdfIn PDF document text
    • https://terigemi.weebly.com/uploads/1/3/1/8/131856376/vutibimonox.pdfIn PDF document text
    • https://bejolikide.weebly.com/uploads/1/3/1/4/131437094/pezeli_ruxagojevuvane_ramilagef.pdfIn PDF document text
    • http://youralteragoods.com/55634866087sgj6j.pdfIn PDF document text
    • https://bonujuvab.weebly.com/uploads/1/3/2/7/132740321/3412601.pdfIn PDF document text
    • http://leoidet.xyz/what_to_eat_to_lose_weight_and_toneu8nt1.pdfIn PDF document text
    • http://orbitan.fun/kagan_cooperative_learning_structures_listr4w3x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bosapaw.rf.gd/duvexetubemim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/960bff47-5ed4-4f1c-80ac-14e5d023e0f5/34792341092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a04db308-b1bf-4ce6-beef-34a6fbde0292/how_much_does_best_buy_charge_to_fix_a_computer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a357902d-6f15-4b8f-b3bf-6aee4e797f5c/how_to_load_a_bell_and_howell_projector.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c27f402a-2fad-4fe6-8bde-67a307995f97/nonafebinufadepijuwulujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/643d886f-8757-4ff8-8455-4261cb89cd41/are_cuda_cores_important.pdfIn PDF document text
    • http://pukavagepipo.epizy.com/zofif.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_off0000e495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE495 5308 bytes
SHA-256: c317ef9794fa74f8b166c20c2b0fcc7bc1f906b6dd00f79a9ca2e08247981807
font_01_sfnt_off0000f690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 11636 bytes
SHA-256: d3d978233191fdddff119cf77fe4cdffdf35e04e8efc14044073a317685436df