Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5591a69f906e9fc…

MALICIOUS

PDF

76.5 KB Created: 2021-04-06 18:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fe645e778e7ff171f02e32a90cc1083 SHA-1: 0867abdac42f355c4c87c2114c3237ca64814d1a SHA-256: e5591a69f906e9fc6e268aa0fe7034f31abf685b7a24f36a80b20c4d8744a70d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, suggesting it is part of a link farm designed to direct users to potentially malicious websites. The document body, though heavily obfuscated, contains references to "Equations of lines pdf" and the wkhtmltopdf application, indicating a lure to disguise its malicious intent. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/award?keyword=equations+of+lines+pdf
    • https://cdn.sqhk.co/nepajenine/Alvgcji/mosquito_sound_test.pdf
    • https://cdn.sqhk.co/zoluxoni/yjgkhi6/best_funny_videos_ever_in_the_world.pdf
    • https://cdn.sqhk.co/noneniwetav/9ieZthh/easy_screen_recorder_app.pdf
    • https://static.s123-cdn-static.com/uploads/4425921/normal_5fc5ec7971bc0.pdf
    • https://cdn.sqhk.co/divoxisig/hdnr8jc/34152122683.pdf
    • https://cdn.sqhk.co/sowanigog/0ihhheJ/pen_pineapple_apple_pen_song_death_note.pdf
    • https://static.s123-cdn-static.com/uploads/4404738/normal_5fcc8a891d5a2.pdf
    • https://cdn.sqhk.co/temetixufuxi/hagcChg/anger_of_stick_100_mod_apk_4.pdf
    • https://cdn-cms.f-static.net/uploads/4416153/normal_602d7ab7d9b4a.pdf
    • https://cdn.sqhk.co/vipikunowi/Rgfhigg/43481788833.pdf
    • https://cdn-cms.f-static.net/uploads/4453105/normal_605ba9c1e48f8.pdf
    • https://cdn.sqhk.co/disumuneriva/gHxhchP/14609442253.pdf
    • https://cdn-cms.f-static.net/uploads/4423136/normal_603a553108a5b.pdf
    • https://static.s123-cdn-static.com/uploads/4479715/normal_5fe0653755c9b.pdf
    • https://cdn-cms.f-static.net/uploads/4447466/normal_6009f4c7eaeda.pdf
    • https://static.s123-cdn-static.com/uploads/4465555/normal_5fdedc4c7e33d.pdf
    • https://cdn.sqhk.co/kidimezamos/pihgiYo/42710050284.pdf
    • https://cdn-cms.f-static.net/uploads/4409258/normal_5fd8286204750.pdf
    • https://cdn.sqhk.co/nilajinipur/jAd0Cgp/archery_equipment_for_sale_philippines.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_0ffe027f21ae4218942099b45bed6eae.pdf?index=true
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_f454127b08f34be2a31fba73671164c4.pdf?index=true
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_839ea6f20965442585774e2165ab3a94.pdf?index=true
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e195.bin
146d7acd621a74f29511311e975295403cdddab288817102fd9643d8adfee17e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 4904 bytes
font_01_sfnt_off0000f253.bin
7657af056828e95720885cd451273d7b6264ebe06637294ff5c69e0e6e936e9d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 10900 bytes
font_02_sfnt_off00011777.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11777 4324 bytes