Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5043fe53f63c51b…

MALICIOUS

PDF

83.4 KB Created: 2021-02-02 06:04:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: dda8dc419ee6663092e0044ec2d62924 SHA-1: 4ff286db8159267556fd52b07ffea37fb8d9da5d SHA-256: d5043fe53f63c51b29e114bf050c0d3fdd3d3850d3daa31f2deab2595462feb2
206 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous links on potentially disposable hosting suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the overall structure points to a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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) 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://baarspo.ru/123?utm_term=east+picacho+elementary+lunch+menu PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411511/normal_5feb7e53d25d9.pdfIn PDF document text
    • https://rokubupudila.weebly.com/uploads/1/3/1/8/131856034/9d1de7f44f0e.pdfIn PDF document text
    • https://cdn.sqhk.co/jogowijalaro/4ogeibo/fairy_tale_princess_dress_up.pdfIn PDF document text
    • https://ligenoleka.weebly.com/uploads/1/3/4/4/134496601/vefuxizelitoziboxa.pdfIn PDF document text
    • https://jaluburevajag.weebly.com/uploads/1/3/0/8/130874017/5224b919f0a17.pdfIn PDF document text
    • https://fobepuwup.weebly.com/uploads/1/3/1/0/131070598/sivenadevivoza.pdfIn PDF document text
    • http://swiss-gear.store/descriptive_essay_sampleccnha.pdfIn PDF document text
    • https://giligigava.weebly.com/uploads/1/3/4/4/134494785/juvexejafifaja_kakonigen_jugatopasakela.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420451/normal_5fcfe8c7d5b83.pdfIn PDF document text
    • https://webunufilijamo.weebly.com/uploads/1/3/4/6/134677486/nakeligudufozafu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490127/normal_5fcc1af7c8a19.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/frJggjf/horizon_blue_cross_blue_shield_mental_health_services.pdfIn PDF document text
    • https://fipugodegiposal.weebly.com/uploads/1/3/4/6/134687615/4378665.pdfIn PDF document text
    • https://vunidiripoga.weebly.com/uploads/1/3/1/4/131453449/rivaxufojajesidaxal.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/h35Y2hj/shark_bites_piercing_emo_boy.pdfIn PDF document text
    • http://sberbank.link/celine_verbeeck_naakttjlmt.pdfIn PDF document text
    • http://makedctl.site/light_o_rama_forumi7ca7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444885/normal_6006bc2d4ce60.pdfIn PDF document text
    • http://jodesomuxuduzu.22web.org/caldera_spa_martinique_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vopuxoke.epizy.com/42651552496.pdfIn PDF document text
    • http://pumukozozuzife.epizy.com/formicidae_hymenoptera_images.pdfIn PDF document text
    • http://suvuxugoboboju.rf.gd/technical_project_manager_interview_questions_and_answers.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_off00010734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10734 5232 bytes
SHA-256: 9bf530373881418069cd8c88b0375d0a739e0c0398bcd9421688348dc3cf3e3c
font_01_sfnt_off000118e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E2 11136 bytes
SHA-256: 14791aa90f655d1f6726bbffa424e0d4a05c4ac9dab25b759258285c96dbebf3