Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6ebcb5bcf9bf64…

MALICIOUS

PDF

78.4 KB Created: 2021-03-18 09:07:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae81da93a244178103f3e709f313a510 SHA-1: 7e764784f6c868e8572e72eadfd6e8987fc8f935 SHA-256: ef6ebcb5bcf9bf64fdcadd1494bd66c54fd3544a3bbd64e4ad8a4b96a5becdbf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to a link farm. The primary external URI points to 'https://lozipotod.ru/aws?utm_term=equate+wrist+blood+pressure+monitor+symbols+mean', suggesting a potential phishing or SEO poisoning lure. ClamAV detection and ML classification further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/aws?utm_term=equate+wrist+blood+pressure+monitor+symbols+mean
    • https://cdn-cms.f-static.net/uploads/4485946/normal_5fd3816b6d851.pdf
    • http://majabekigasegav.iblogger.org/61898620371.pdf
    • https://cdn-cms.f-static.net/uploads/4367297/normal_6016ac1b2d8ed.pdf
    • https://cdn-cms.f-static.net/uploads/4404969/normal_6011e26d3410a.pdf
    • https://static.s123-cdn-static.com/uploads/4485322/normal_5fd075369999f.pdf
    • https://cdn-cms.f-static.net/uploads/4413573/normal_60199968c1c70.pdf
    • https://cdn-cms.f-static.net/uploads/4373526/normal_601e06598f23a.pdf
    • https://cdn-cms.f-static.net/uploads/4366306/normal_6034707a22de9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://xigufogadenake.epizy.com/fabumukijewamesetijidowim.pdf
    • http://benamow.myartsonline.com/how_to_play_hand_drums_for_beginners.pdf
    • https://s3.amazonaws.com/susonanezaj/6042418849.pdf
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_39168e4838bc4c489f9cc73d8c6eae54.pdf?index=true
    • https://s3.amazonaws.com/kulinisokakewi/twitter_for_blackberry_9320.pdf
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_acf5476073244058b5a09a6997902165.pdf?index=true
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_cbcb93c9f49f4783825b216f77dd958e.pdf?index=true
    • http://nudifezidezi.rf.gd/why_does_my_lg_tromm_washer_smell.pdf
    • https://s3.amazonaws.com/lupuvogotog/76196854703.pdf
    • http://tigagatu.atwebpages.com/63614264670.pdf
    • http://runatavakez.epizy.com/stihl_chainsaw_ts420_spark_plug.pdf
    • http://totuxivez.onlinewebshop.net/vigid.pdf
    • 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_off0000e704.bin
5510a16016c5b5a19fe1dbbeb18d350c9da76afafbe5ad2e07d53e6f18f59288		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 5404 bytes
font_01_sfnt_off0000f958.bin
b145c8ba709ff9ab8cf757b2a8939558f8557cdac3567bd3f8e4ecb4b42ae851		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF958 10804 bytes
font_02_sfnt_off00011e14.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E14 4324 bytes

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