Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d796f2b870cdb2…

MALICIOUS

PDF

76.6 KB Created: 2021-03-17 01:03:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa1601b8242a9cbccbd4cfbff4433ad9 SHA-1: 368e2bbb2035ddd7186565de2f5a7afa4e862f6b SHA-256: 16d796f2b870cdb2f33dc52f4271df4cf5e59089f04adb418522bd0efa1d5510
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to appear as search results. The primary URL, 'https://bologen.ru/wix?keyword=codex+angels+of+death+pdf', suggests a lure to a malicious site. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=codex+angels+of+death+pdf
    • http://frasqen.online/77130972965bcepo.pdf
    • https://cdn.sqhk.co/pijavagoke/eIIq7o4/pasig.pdf
    • https://cdn.sqhk.co/nodujugebi/jcjcAji/95801928409.pdf
    • http://erethiztzj.space/15734233791c6l6a.pdf
    • https://diwodineguxep.weebly.com/uploads/1/3/4/3/134305573/kejutedo.pdf
    • http://itawomen.fun/wovokazugupememikiniaogjf.pdf
    • https://cdn.sqhk.co/goduwonon/3idVrjh/85278511667.pdf
    • https://febamepu.weebly.com/uploads/1/3/1/0/131070604/lofebomesevufodidep.pdf
    • http://thedouche.xyz/does_stock_exchange_work_on_saturdayjfyrk.pdf
    • https://cdn.sqhk.co/jobiwokojo/ihdhhvh/57323456466.pdf
    • http://bristol-yalta.run/mississippi_burning_questions_and_answersy915m.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_dfa072cc30e1418d88b8c02695c8d697.pdf?index=true
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_382eb97b1c3245838e7bcfc92e8d5a21.pdf?index=true
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_d1dc0b4edc824ab180ccc36619755324.pdf?index=true
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_6a9eed130f8e44b9a0b11743e29fb54e.pdf?index=true
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_7d2b9593917942c9b8531b49db39b45b.pdf?index=true
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_a5a62d6a68a44b71b89944c15c5279c0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b058cdf8-5416-4878-b86a-acd71947f40e/surah_yasin_full_beautiful_mp3_free_download.pdf
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_f8dc421e80f242ef9b3631668ccfb836.pdf?index=true
    • https://e24ff460-1725-4b9d-a7de-f8438c38fea0.filesusr.com/ugd/366850_3bb7af67a98743f49b20541f3b919c20.pdf?index=true
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_f381c40d9e524bf087923efd83d53abc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/92bae819-3082-422d-9c95-28a03419e21c/tesema.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec64.bin
ef7e1651467972c2db9fff937f5c3891b043a577bdc5627d8c1ca8b79f3661dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 5180 bytes
font_01_sfnt_off0000fe11.bin
a6ad91b66a5b7b9c830afd30a817addb6c32795e95ff5e38451a3a8b1b1ac272		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE11 11036 bytes

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