Malicious PDF — malware analysis report

Static analysis result for SHA-256 359ce31b0fe4a36c…

MALICIOUS

PDF

98.4 KB Created: 2021-04-21 01:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6638ae4fc249122a835a13c4e953234 SHA-1: de88457cc8e553e2cd3cb39e55ea205d4d15e4a1 SHA-256: 359ce31b0fe4a36c8e3cac1377b9c6ca0311d55028954dfeab993ab3886e4d54
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on dynamic DNS services or file-sharing platforms, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/strik?utm_term=how+to+write+good+essays+for+college+application
    • https://cdn.sqhk.co/letarezetap/jjgcjiX/bluestacks_hd_app_player.pdf
    • https://cdn.sqhk.co/zisujidixa/gighfif/89033910081.pdf
    • https://dipitamadupod.weebly.com/uploads/1/3/4/8/134882687/6970465b.pdf
    • http://ketrovk.xyz/326623903441bq39.pdf
    • https://xovarexo.weebly.com/uploads/1/3/4/8/134895284/9427962.pdf
    • https://cdn.sqhk.co/bujasugawo/jTIB9hh/mexavolowetaxu.pdf
    • https://depagolal.weebly.com/uploads/1/3/0/8/130813973/7480755.pdf
    • https://vetolotex.weebly.com/uploads/1/3/1/3/131379132/1776095.pdf
    • http://kukushpa.fun/working_iptv_stalker_mac_addresscocwi.pdf
    • http://megahit.space/arches_national_park_guide29656.pdf
    • http://busforpay.online/35076529637ma7vv.pdf
    • https://cdn.sqhk.co/javeduner/gghvz2A/52258410636.pdf
    • https://cdn.sqhk.co/subesanodag/8TheBMw/small_led_flashlight_keychain.pdf
    • http://usesol.xyz/kuboroburojurogabaju8lwcs.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://soreras.epizy.com/the_city_and_the_city_book_ending.pdf
    • https://s3.amazonaws.com/wiwuxot/20066927299.pdf
    • https://s3.amazonaws.com/sowewazulejewi/najuwofomujup.pdf
    • http://fuzazoxavuvuw.rf.gd/australian_universities_list.pdf
    • http://suzisovizereri.epizy.com/81331828149.pdf
    • http://nujufotesu.epizy.com/gopezaxapexokozos.pdf
    • http://pigepitusedotet.rf.gd/3671559354.pdf
    • https://s3.amazonaws.com/tuxexi/assembler_system_programming.pdf
    • http://roxonolabixatox.epizy.com/fiwimujebitorotinuge.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_off00014431.bin
93f1664cf50393bbb34c7b7c63ce6bb1c9aba79cd762ba48133bde1e5d1f07c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14431 5476 bytes
font_01_sfnt_off000156fe.bin
04dca6eaf13d97fc5e72159bffa97e573be56c62a8881206b35dbf955f614363		 pdf-font-stream PDF embedded font (sfnt) at offset 0x156FE 10720 bytes

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