Malicious PDF — malware analysis report

Static analysis result for SHA-256 69ec752c0d077f0e…

MALICIOUS

PDF

87.8 KB Created: 2021-04-06 13:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d79e4ffbeeebd6b10608303d40b7103 SHA-1: a4553f0633f6df8b9dca22992fb2326294d209e3 SHA-256: 69ec752c0d077f0eff7ca7ee210d5eacebb9df759ac98adc5eff62867a0e2d85
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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 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://nipisod.ru/123?utm_term=live+video+broadcasting+software+free
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/7dc5dd3.pdf
    • http://repair-kompov.ru/jowerunexodaga3szin.pdf
    • http://woxagaxizi.22web.org/arpanet_in_computer_networks.pdf
    • https://xetakafiso.weebly.com/uploads/1/3/1/8/131856826/c6a4e998eb.pdf
    • https://ziduxaxeg.weebly.com/uploads/1/3/1/3/131380546/gefajapemotup.pdf
    • https://daviwoza.weebly.com/uploads/1/3/4/6/134670821/mujuwol.pdf
    • http://fugisipadizov.22web.org/celebrity_endorsement_and_purchase_intention.pdf
    • https://varijiligedag.weebly.com/uploads/1/3/1/3/131383591/degolebor-vufibekix-xexugegof-pakavo.pdf
    • http://italysummer.fun/angry_birds_bad_piggies_20-_2q96rx.pdf
    • http://scarcebook.com/que_come_el_oso_perezoso_de_3_dedosnys8s.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_23fd229fddec418c850eeacb3e2850ac.pdf?index=true
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_a7a8f80ad2d845bab1557944fbbbec5a.pdf?index=true
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_f84649f300c5449bb7791e1029640671.pdf?index=true
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_20ce7795bba24fdd992433bd9098d727.pdf?index=true
    • https://7fd4abad-31f8-4c52-ae8e-93d0cc7f2af2.filesusr.com/ugd/910e70_890340571abc4420beb3cdecce369f1a.pdf?index=true
    • https://s3.amazonaws.com/purufiz/199142797.pdf
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_605d35011a0c4a8a8b754d924649cbe9.pdf?index=true
    • https://s3.amazonaws.com/wapabefizosumi/vita_anticonformista_significato.pdf
    • https://cc4f1b1a-08c7-467e-bb5a-e3073ad8caf1.filesusr.com/ugd/ffc175_f8484d2368f543e594b1b462de16fbf1.pdf?index=true
    • https://s3.amazonaws.com/tugabijenovili/2206720930.pdf
    • https://s3.amazonaws.com/muvarelo/zanefomesoradejorekiro.pdf
    • https://6997f972-013f-4c6f-ac95-4179ba17a557.filesusr.com/ugd/549e1a_185148255739402a86d473ff1058333f.pdf?index=true
    • https://s3.amazonaws.com/bupaxomu/25232105649.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119bf.bin
cc3c4967a5409fe484454c7a9cb89ceb272eeeb7048fa6976233f2ac4653dbcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119BF 5392 bytes
font_01_sfnt_off00012c3c.bin
985c92969d8a41e8cf1255ff9626cd8bf7db3da115d990edf9587ad4c3503b56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3C 10836 bytes

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