Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc92881ad2a8a49…

MALICIOUS

PDF

84.3 KB Created: 2021-04-06 14:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7aa3a49bbc253a0cfca0fd42aec68020 SHA-1: a28366b2594d2108b5e1092328813f069e9e631d SHA-256: 3cc92881ad2a8a4927bd4de9259f46db6a0a789134b90ddca4e5389bb22f2fcc
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and known redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of lures designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://crophysi.ru/strik?utm_term=how+to+use+silk%2527n+flash+and+go In PDF document text
    • http://kopuvimu.scienceontheweb.net/engineering_drawing_boxed_dimension.pdfIn PDF document text
    • http://allerlo.xyz/how_to_replace_battery_cateye_strada_wirelessggyqt.pdfIn PDF document text
    • http://bexixibeguben.sportsontheweb.net/learn_akan_language.pdfIn PDF document text
    • http://braco.ru/46667290648mg1mm.pdfIn PDF document text
    • http://20970907.net/dell_latitude_d830_specs0zbfv.pdfIn PDF document text
    • https://cdn.sqhk.co/narulaloro/jiEhdhf/ping_pong_the_animation_director.pdfIn PDF document text
    • https://cdn.sqhk.co/juxezijafoz/MmhfxY8/run_run_rudolph_5k.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/allison_transmission_fault_code_reset.pdfIn PDF document text
    • http://businessoutsourcing.org/wefuwogisamzuxzv.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/eSgidHQ/62960897358.pdfIn PDF document text
    • http://devigebogubiret.getenjoyment.net/71369831482.pdfIn PDF document text
    • https://cdn.sqhk.co/womafafowix/jcYigUc/causes_of_imperialism_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/zaweniwefi/ihiF15y/lirik_lagu_wolo_got7.pdfIn PDF document text
    • http://zibikudupe.mywebcommunity.org/prefixes_suffixes_roots.pdfIn PDF document text
    • http://chaptejvxz.fun/does_tom_bombadil_represent_godea27z.pdfIn PDF document text
    • http://ladekepevij.mygamesonline.org/jevivozuvalesakelotezewe.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
    • http://muluwokixo.onlinewebshop.net/third_conditional_reading_comprehension.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/kosutozevosexaru.pdfIn PDF document text
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_42d7efe1b12c4425a1a4be09921f0a4c.pdf?index=trueIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_0c472917eaf74143b3ad2ccd521fc626.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 5104 bytes
SHA-256: 97ce11b7f1c682d7188fea7431a7fee783a211a65ce2f1793183cc7ff31505dd
font_01_sfnt_off00010ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBD 11380 bytes
SHA-256: 7eea8fc5cbba30f640735f3ab233ea8bf5e2f9fb46e079d9543b4de65c083436
font_02_sfnt_off000135c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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