Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdde1cca690ed1e6…

MALICIOUS

PDF

79.6 KB Created: 2021-04-08 06:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eed67b0c3d0f26a08079a9718808c999 SHA-1: e2e1b96dc4b7a477b742db4457036d4d9f085f7f SHA-256: cdde1cca690ed1e68123d80337639550bde68ed09a090b624f50612db196b874
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The 'SE_CLICKFIX' heuristic indicates social engineering tactics, instructing the user to execute commands, which is a common method to bypass security measures and download further payloads. The embedded URLs suggest the document is part of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://vilenefex.ru/strik?utm_term=hp+deskjet+2541+won%2527t+connect+to+wifi
    • http://legalvictory.group/fullstack_react_book_githubvnhft.pdf
    • http://derilezin.sportsontheweb.net/arcgis_desktop_advanced.pdf
    • http://rovanenafet.getenjoyment.net/wunevesogabosim.pdf
    • http://cardioactiveuficiale.site/the_dream_giver_chapter_summarys35p5.pdf
    • http://segaruzobuguses.scienceontheweb.net/after_book_3.pdf
    • http://gokojun.scienceontheweb.net/simple_english_books_free_download.pdf
    • http://c-advance.space/lojamezapokoziji3h4xy.pdf
    • https://sidusumidiwef.weebly.com/uploads/1/3/4/3/134366372/mogeki.pdf
    • http://pafowitowa.medianewsonline.com/additional_mathematics_pure_and_applied_jf_talbert.pdf
    • https://sajixigepanosu.weebly.com/uploads/1/3/1/0/131070231/0e2ad1344b910d.pdf
    • http://firobazotu.sportsontheweb.net/carbozinc_859.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_b090e3dd7b5f4c028d62f840ccbcca0b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ce57085e-e287-4359-a5d7-05bafbcb6560/1723162431.pdf
    • http://zagupijalixi.myartsonline.com/kawavonuzatunuxifov.pdf
    • https://1a73feee-b327-4bc5-ac54-9d367b44a425.filesusr.com/ugd/226baa_62380429822f427383b70b5675e23c57.pdf?index=true
    • https://uploads.strikinglycdn.com/files/db0ba81f-a030-4c11-89ee-7fa5bcda9152/16251075794.pdf
    • http://disoluje.myartsonline.com/sotinimedademutumixawu.pdf
    • https://uploads.strikinglycdn.com/files/14117eec-aba6-4c7f-84d5-b4a06a00dbbe/20529397201.pdf
    • https://ef9d90ca-5811-4a1c-810e-75bcfae60121.filesusr.com/ugd/a33af7_69ccd63224554e38862b3627f599fd16.pdf?index=true
    • http://sabiwilurase.atwebpages.com/rofazonuxivipe.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e188.bin
58fc4583f572cab06d2c4b555b9744547368e171d5fa4829e55db8a2a9a9bab4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE188 5432 bytes
font_01_sfnt_off0000f457.bin
c37af7e7cfec3bbcb1b8a4eb31dc62e8e6329c24834645bfa67e5fabfe93acb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 10984 bytes
font_02_sfnt_off000119ed.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119ED 16204 bytes

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