Malicious PDF — malware analysis report

Static analysis result for SHA-256 7abee2453415d613…

MALICIOUS

PDF

77.4 KB Created: 2021-03-22 12:37:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 194477345f8a4c9688591002ec5d6b61 SHA-1: 54648fae76b64af77d7f1b17eef0ccf1d2ee2c82 SHA-256: 7abee2453415d613682a408e1f090458160f88c41b6b982f493f8bc2f4235260
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are obfuscated or lead to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to sites hosting malware or phishing content. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

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-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://kuzutuzo.ru/wix?keyword=no%2524gba+android+apk
    • http://sq11mini.com/bubble_shooter_classic_paid_apkp3xgy.pdf
    • https://cdn.sqhk.co/biserodafed/jghciih/4611714687.pdf
    • https://cdn.sqhk.co/baxoladipezu/f4Bgcxs/92175517935.pdf
    • http://hiziryigit.online/551141627blypd.pdf
    • https://milubede.weebly.com/uploads/1/3/4/3/134349056/3a62d7668e33093.pdf
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/f7b3f3f0e992971.pdf
    • https://cdn.sqhk.co/molipigi/llUn0ib/gajulivovudijofimilolik.pdf
    • http://hackins.site/what_to_say_when_giving_money_as_a_birthday_giftvj4hh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_5429ef5d63284c0e888aa221a8400cc9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2544a5e1-4f9c-414d-9c79-4d69cc348b61/jegexutiwawugiw.pdf
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_1e96d30f7d82427ab950f9b15452126f.pdf?index=true
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_9a67d006193044a1b9be120bd4f90323.pdf?index=true
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_aabc3b7ac51c4ac5b81eb67b660c5e48.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0b4251f2-d7bb-4f91-ad32-9c245f04a390/makador.pdf
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_1162afe9e3244b90a6eb90815a4370ff.pdf?index=true
    • https://uploads.strikinglycdn.com/files/951fbf10-0d83-44bf-b5cd-2127002f2a12/stocks_and_shares_for_beginners_books.pdf
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_24c473f76abf4843ae0bf4ee78fb663e.pdf?index=true
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_c5de3f218fd546eb9f17b9eb22e6fa05.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efa3.bin
8c7170b3002915ffb639a6417a8390f0e7c5c40d294e801adc882fb4c0b95e80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 5328 bytes
font_01_sfnt_off000101dd.bin
01051f04dfbe1179cd819b18f6c9c8b8f4e7a91473fa9cab7b774d7453da8ffb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101DD 11564 bytes

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