Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd97ec603435824…

MALICIOUS

PDF

78.9 KB Created: 2021-03-31 07:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c2a38c71217980269d4de95588ba90f4 SHA-1: b0774adfcc1cf4417bdc97e0ddfb73e2747cd666 SHA-256: abd97ec603435824b0f93d9e04a6bc67633f477bb33b749c2433b384b4f0e2d6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high probability of malicious intent. It contains numerous embedded URLs, with at least one pointing to a domain associated with link farming and disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and date/time information, but no clear textual lure.

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://baarspo.ru/wix?keyword=exponential+growth+and+decay+word+problems+4+answers PDF link annotation
    • http://wosojedawujemi.iblogger.org/real_estate_assignment_agreement.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/k7gcgil/sniper_3d_gun_shooter_free_shooting_game_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374373/normal_601f2e0af0104.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446030/normal_5fcd3404bc97b.pdfIn PDF document text
    • https://cdn.sqhk.co/dijowasedop/djcnjC7/resorajenixok.pdfIn PDF document text
    • https://sunivisoxeban.weebly.com/uploads/1/3/4/4/134493344/4c334.pdfIn PDF document text
    • https://cdn.sqhk.co/xonafelog/iYP7zib/86437780920.pdfIn PDF document text
    • https://vatikaleme.weebly.com/uploads/1/3/5/3/135386674/5262217.pdfIn PDF document text
    • https://tugalebuwe.weebly.com/uploads/1/3/4/0/134012885/wasilepuxelere.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/UCEtjfG/drum_kit_for_sale_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://moxurux.epizy.com/uber_brand_guidelines.pdfIn PDF document text
    • http://jaforafonox.rf.gd/11508428392.pdfIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_b21bff3af2ee4564ab70d116c3c1476a.pdf?index=trueIn PDF document text
    • http://vimonaker.epizy.com/enzyme_reaction_rates_worksheet.pdfIn PDF document text
    • http://parubixus.rf.gd/gopunab.pdfIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_60352b617f1548778f46776b47051f3a.pdf?index=trueIn PDF document text
    • https://6fc76513-a17a-4053-940d-bef108f5ea85.filesusr.com/ugd/3a5ef0_4a6d1656872343d5a9b2e0502659a313.pdf?index=trueIn PDF document text
    • http://luwawabegopit.rf.gd/beautiful_day_michael_buble.pdfIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_3bc7c5bf0be847a6badfd075fa99a33f.pdf?index=trueIn 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_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 5932 bytes
SHA-256: 51021ba908990106cafbc76773f288c8b248da936f71c83556b6aa0c388220d5
font_01_sfnt_off000106e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E3 11476 bytes
SHA-256: 70c429525c5447383f4c8e7f0b83bd8e5b5d944ff8d8ff1f31043ccc2d8207de

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