Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec2c813d869fae4…

MALICIOUS

PDF

121.7 KB Created: 2021-02-27 09:19:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d43c2acf8b0dbedd4c41200925b031b4 SHA-1: 485ab83f66724f5ca4a7ff4a344ac87972f09697 SHA-256: bec2c813d869fae4a8dd77c952f1d75e38fe6d798d040e41aa5bf129199591ee
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains references to search terms and application names, possibly as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nipisod.ru/wb?keyword=neil%20gaiman%20comics%20sandman PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454290/normal_5ffca40f6c1cc.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/rizisorutijuneligo.pdfIn PDF document text
    • http://navaram.online/john_gba_lite_how_to_use_cheats579nr.pdfIn PDF document text
    • https://cdn.sqhk.co/dederubap/oig4hiD/samsung_level_active_bluetooth_headset_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483365/normal_6035313f16315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459165/normal_60217d11b7586.pdfIn PDF document text
    • https://cdn.sqhk.co/zufuxirap/ib4jdz3/download_baby_bunny_my_talking_pet_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459029/normal_6037fd6ef146b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470679/normal_6008e09e7a2df.pdfIn PDF document text
    • http://vkrowl.com/bible_commentary_on_matthew_6_22_23m2xkz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444655/normal_5fcef564d908d.pdfIn PDF document text
    • http://naykaryadom.fun/letting_go_worksheets_for_adultsfl6kn.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/jejcDie/tobogodufuxuwa.pdfIn PDF document text
    • http://egosikenclub.com/darirerixosh70fh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_5fda7f9adec50.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/begijufadi/noveginifalazubomowegaz.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/kiwaxezenuzemasiv.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/31612810340.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_off0001a189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A189 5132 bytes
SHA-256: 9c49b0f744dc6e0eb6a89de1c9de4c92f2d069567f8f17025202e637d9107708
font_01_sfnt_off0001b2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2F1 11464 bytes
SHA-256: 0edd683a8427550f5181450b96f4ca6a299cbc71dfe6d8c8b75923a003d5a824

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