Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc535e15df0d793…

MALICIOUS

PDF

75.7 KB Created: 2021-03-17 19:12:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b3ef224d5b5bf27c612278eccaf33321 SHA-1: 78955474f86e331c98e7b3ddfb524d2fb4d31ed4 SHA-256: 4fc535e15df0d793631460e378892f49a5077449c9f103c25a31e85e66b573c2
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirect to malicious infrastructure. The heuristic firings indicate this PDF is a link farm designed to redirect users to malicious sites, and ClamAV detected it as a phishing trojan. The document body, though heavily obfuscated, appears to contain text related to recipes, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=indian+veg+dinner+recipes+list In PDF document text
    • http://weareanonymous.org/gasefox8dc5n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450141/normal_5fff7478c0614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_5fd7303c4ff9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486215/normal_6041781b4fa71.pdfIn PDF document text
    • http://twobigs.space/asphalt_nitro_for_pc_mod_apkapavg.pdfIn PDF document text
    • http://indohealth365.online/lgebra_booleana_ejercicios_resueltosl1g64.pdfIn PDF document text
    • http://keto-menu.online/pulanikuluxawume6fvu8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393358/normal_5ff31d76df581.pdfIn PDF document text
    • https://pukexomupuko.weebly.com/uploads/1/3/1/1/131164185/5836217.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/66126950052rl7kg.pdfIn PDF document text
    • https://fologonalufofu.weebly.com/uploads/1/3/4/6/134694067/2739926.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/42775718-d58e-4ced-a255-b8d7a3c57031/jokotikixufokuwimixupit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d504eeb-90f2-43ac-9c44-b9452a211e52/spartan_yokohama_tire_flip_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxegu/how_long_after_stopping_ambien_will_i_fall_asleep.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/gumesixarusikefowagaro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cce89929-b30a-477b-a2fe-cd3d7561d774/cateye_astrale_8_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/zamaluseximasitujir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a4597bf-d11c-49e5-8a28-e550452d48b1/dirt_devil_power_max_rewind_pet_bagless_upright_vacuum_ud70187_belt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26bf9bcd-13f5-43d8-9d76-ea290977e48c/92133366247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52f3b784-de1b-45a0-8c4a-04549fa92f77/digital_marketing_executive_jobs_for_freshers_in_bangalore.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/kozugotulobosexi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBD 4916 bytes
SHA-256: 23fb1a3954948a95311756fbc1b017e85e6cd096db4ef5ca34be29100574b084
font_01_sfnt_off0000ed7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 10576 bytes
SHA-256: 2f5f93e8d37d6d269d3259d9927f2249e503398bd6f28f69cde78f182dad41ee
font_02_sfnt_off0001116b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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