Malicious PDF — malware analysis report

Static analysis result for SHA-256 642b2f18b547aaa6…

MALICIOUS

PDF

74.7 KB Created: 2021-02-16 08:06:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: bb62ae8a58e1f5fd422e87d6e225c69b SHA-1: 05041ce35f7ed0ae1f68a086edff51891ad933d1 SHA-256: 642b2f18b547aaa698092fa85a9ecf7101a74508d4d4e8dcb7d833fef6de924a
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to fixing a device, likely to trick users into clicking the malicious link. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=how+to+fix+toshiba+fire+tv+remote In PDF document text
    • https://cdn.sqhk.co/vefoveted/cibvPid/leo_and_tiger_woman.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/69149381837lmjw3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367013/normal_6007d371005fa.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/jgY2Gdb/fishing_paradiso_mod_apk_2._0_6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448984/normal_5ff6695df3471.pdfIn PDF document text
    • http://vk-settings-change.online/unlock_reading_and_writing_skills_3_unit_4z6o6d.pdfIn PDF document text
    • https://cdn.sqhk.co/mapiwoda/eK5hejb/king_of_thieves_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/wgeCHhd/guwoxuretojesini.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/WFib5hg/17682584223.pdfIn PDF document text
    • https://cdn.sqhk.co/fafojipedul/aIjh3do/tiderizegisixovimonuvet.pdfIn PDF document text
    • http://pristav.pro/bluecoat_proxy_tutorialqnlp0.pdfIn PDF document text
    • http://bnl-jobs.com/38486608266hkuvi.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/Pgjgijd/temukinonelitokajebasu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413977/normal_5fcc443b4b0e3.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/gfdticb/kofedurupusof.pdfIn PDF document text
    • http://mandarin-fruit.space/73757886474puyax.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/XmLj4gf/disney_package_cost.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://turojupa.epizy.com/wiwemixedudup.pdfIn PDF document text
    • http://sorajapiliwixod.rf.gd/elves_vs_dwarves_game_guide.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE631 5296 bytes
SHA-256: 23c5b56d2559e5eadc32db2138ee63c5aac117bae1a28a3b08dd07807d66bccf
font_01_sfnt_off0000f825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 11016 bytes
SHA-256: 7406a7b06cddca2bc9e46e55ac603480d70be1dc39565b6fa7c2a8ae91856bd2

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