Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e4cadda56ff9df…

MALICIOUS

PDF

74.3 KB Created: 2021-06-07 12:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 678aaf60c1fde4cb4993a216fc62e546 SHA-1: 230533e8611046179e06cd1cd5f5e9e469158fe2 SHA-256: 20e4cadda56ff9dfdf4bfd82529b466be67b1f3366502c2ffaecfb29bf7f4432
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to manipulate search engine results or redirect users to malicious sites. The embedded content appears to be obfuscated, but the presence of external URIs and the link farm heuristic strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crewmak.ru/pbw?utm_term=chinnanchiru+kiliye+bharathiyar+mp3+song+free+download
    • https://vamexerop.weebly.com/uploads/1/3/6/0/136085595/momarekumuv.pdf
    • https://wovodolu.weebly.com/uploads/1/3/4/8/134861979/6455130.pdf
    • https://tuzuviletug.weebly.com/uploads/1/3/4/6/134680759/5927187.pdf
    • https://gogijufiwadika.weebly.com/uploads/1/3/4/5/134581681/4684499.pdf
    • https://razolonupul.weebly.com/uploads/1/3/4/8/134888498/kigije-lalijudud-fejasubudivu-xisotufotodu.pdf
    • https://xugowumilivave.weebly.com/uploads/1/3/4/8/134846580/2857e401d4.pdf
    • https://static.s123-cdn-static.com/uploads/4428342/normal_5fe2c6b21e29c.pdf
    • https://gujavaluzosozu.weebly.com/uploads/1/3/4/0/134013303/19be1.pdf
    • https://cdn-cms.f-static.net/uploads/4369908/normal_600d98d0b071d.pdf
    • https://ladofozaser.weebly.com/uploads/1/3/4/3/134334290/pazubakuwunoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ruwomodanom.pbworks.com/f/where_can_i_learn_basic_carpentry_skills.pdf
    • http://nigezid.pbworks.com/w/file/fetch/144416958/resignation_letter_format_in_word_hindi.pdf
    • https://uploads.strikinglycdn.com/files/c5e10919-5eb7-4441-ade4-204774d9b85a/belefujiwosalujewoxiz.pdf
    • http://fatakalewene.pbworks.com/f/standard_form_to_slope_intercept_form_worksheet_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/24cdba13-0230-49c3-946b-fc352fcf704f/97084353605.pdf
    • http://funinupun.pbworks.com/w/file/fetch/144427023/25666917133.pdf
    • https://uploads.strikinglycdn.com/files/a692659c-349d-451b-a23a-2cbd7577b80d/60625269409.pdf
    • http://barumena.pbworks.com/w/file/fetch/144777801/30533388480.pdf
    • http://werinenimuta.pbworks.com/w/file/fetch/144628677/download_bts_bon_voyage_season_1_sub_indo_full.pdf
    • https://uploads.strikinglycdn.com/files/1acc6c38-03ec-49b9-a62f-f44e3ad241b2/greetings_in_arabic_with_english_translation.pdf
    • http://zajozote.pbworks.com/w/file/fetch/144438555/ripabiz.pdf
    • https://uploads.strikinglycdn.com/files/6ae25bb8-a1dc-4a8a-b149-65eef1e55f2f/zunibubofudux.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_off0000e261.bin
fdad8aa50ac00d47f9d8cf87e66090274a1775847300bd2b51951b323637c5cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 6036 bytes
font_01_sfnt_off0000f6d2.bin
b19cb717356fb4c0bb2257e2827ea7a98dc3b419f295644b9a46558d80bce920		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D2 10712 bytes

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