Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2656ce0adad32d…

MALICIOUS

PDF

77.2 KB Created: 2021-02-17 20:51:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6290fa2227535c88d4f45523a9f5ddb1 SHA-1: 45b653ea9809cfdc5715454caae13955c0b1f875 SHA-256: 4e2656ce0adad32d0fa620bc2a3c5dcf3e0ef6eda630c90a35d0909739560ff2
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically calls out this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a lure to external malicious content, likely involving JavaScript execution within the PDF viewer.

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
  • 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://maypoin.ru/wix?keyword=house+of+the+faun+alexander+mosaic PDF link annotation
    • https://cdn.sqhk.co/ropobemuma/hididgf/auralux_constellations_toll.pdfIn PDF document text
    • http://tidemelewofu.iblogger.org/waterproof_fitted_sheet_ikea.pdfIn PDF document text
    • http://muwazosibavefed.iblogger.org/chloroform_definition_for_kid.pdfIn PDF document text
    • https://cdn.sqhk.co/fularulojoze/hdibGzE/sad_glass_making_it_happy.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/cCubCjd/76485246161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387939/normal_5fd644605718c.pdfIn PDF document text
    • https://cdn.sqhk.co/derubejes/jjabjhz/free_online_games_to_play_now_no_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392215/normal_5fffc3fb21e88.pdfIn PDF document text
    • https://cdn.sqhk.co/ketifoseja/ejjha9b/sonic_adventure_remake_2021.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/iewhdib/how_to_make_paper_claws_youtube.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492245/normal_5ff5f7eeb76bf.pdfIn PDF document text
    • http://pufegusikozig.22web.org/anger_of_stick_5_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/qibhegg/subapigarowemujunixil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nepowatalol.epizy.com/korinewomiwegufarix.pdfIn PDF document text
    • http://gefuxexo.epizy.com/98107773561.pdfIn PDF document text
    • http://ruraduwajisiv.rf.gd/45874534706.pdfIn PDF document text
    • http://zekubegem.epizy.com/19288560020.pdfIn PDF document text
    • http://davutawopoban.epizy.com/meiosis_and_mitosis_differences.pdfIn PDF document text
    • http://ribibepope.epizy.com/19640252019.pdfIn PDF document text
    • http://wosamufudov.epizy.com/self_guided_bike_tours_of_italy.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_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 5292 bytes
SHA-256: 7ae418dffec76db1ebba310982e1e8b6384b64b1b5eaa3b0f1cddb2fa7cf44d9
font_01_sfnt_off00010390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10390 10372 bytes
SHA-256: 8282c896ec7d3e3b427f28042c448016da27c7b80496c966488f9fe1e1f2c4ac

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