Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d28efd0b2cfddb8…

MALICIOUS

PDF

67.3 KB Created: 2021-02-23 05:56:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 4aaffc5b056bed67f2567f2e043be0a0 SHA-1: 9c2b68618bf5b763555c6caee98c468ab51a0e0d SHA-256: 7d28efd0b2cfddb8a69ffee5c54c239ccc9b9000917f441491f165239a11e9da
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'pool cue weight guide', which is likely a pretext to drive users to malicious websites. The presence of external URIs and the link farm heuristic indicate an attempt to distribute or redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://druttle.ru/wix?keyword=pool+cue+weight+guide PDF link annotation
    • https://cdn.sqhk.co/soxuvezosapa/jCyBjgF/ceramic_art_tile_shops_osborne_park.pdfIn PDF document text
    • http://zuwaweno.iblogger.org/call_of_duty_mobile_garena_hack_android.pdfIn PDF document text
    • http://4gusevshop.website/81960201845ntg76.pdfIn PDF document text
    • http://activa-fb.com/g_star_cad_2018_free2tol6.pdfIn PDF document text
    • https://cdn.sqhk.co/jalosemuv/geihQgj/90077374999.pdfIn PDF document text
    • http://gevazuvunurodum.22web.org/21697995836.pdfIn PDF document text
    • http://inostrana.com/practica_forense_civil_y_familiar_pduo8g7.pdfIn PDF document text
    • http://detonic-italy.website/chatterjee_physiology_free3qdy3.pdfIn PDF document text
    • https://cdn.sqhk.co/tedefoso/hhbApjh/91239437412.pdfIn PDF document text
    • https://cdn.sqhk.co/vuranataxu/ihjLqfQ/notis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tewidunutazi.rf.gd/85761154070.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/analog_camera_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/why_does_my_weed_eater_dies_when_i_give_it_gas.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/xibopipasolakawusope.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/69791393425.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_off0000cdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB0 4812 bytes
SHA-256: 0c8e67d05c07a486dd604e615381f4ad5ada62c7746d437ba564af74c7e507d9
font_01_sfnt_off0000de1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 10164 bytes
SHA-256: 28fb9ff905e1d47f19f8445f6319ac2f81bfb6dcd9c692bbf946807438a60e63

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