Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbfd4d2791a564b2…

MALICIOUS

PDF

98.1 KB Created: 2021-03-20 02:35:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed9ef1a187320718ff5104c6408e0116 SHA-1: 7a1fb4e081f6882b8488a1cf5deda0a5ace3e687 SHA-256: bbfd4d2791a564b23e18b7f0be72d213871876c0abd7aa97d38330be1f0c7f61
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://xezojetit.ru/award?keyword=lc+oscillator+theory+pdf
    • http://wonder-ita.fun/china_embassy_authentication_formfnlse.pdf
    • https://sugowula.weebly.com/uploads/1/3/4/6/134646485/29e8dae72cb3e36.pdf
    • https://remezimivof.weebly.com/uploads/1/3/4/5/134582621/nebox.pdf
    • https://cdn.sqhk.co/dedikunakudu/jjpgelW/19512138412.pdf
    • http://begemotiks.space/taremamevelulaluzozturze.pdf
    • https://xukifunizagopo.weebly.com/uploads/1/3/4/0/134013279/vulosojewire.pdf
    • https://mujonuwamuvix.weebly.com/uploads/1/3/1/3/131383921/c5178009da59.pdf
    • https://cdn.sqhk.co/taguvomir/QiihdaJ/dragon_ball_raging_blast_cheats.pdf
    • https://muwalarole.weebly.com/uploads/1/3/5/9/135959937/7838190.pdf
    • https://salogisamokowo.weebly.com/uploads/1/3/4/6/134649366/5072904.pdf
    • https://cdn.sqhk.co/forexidof/gbjbBgc/85300180561.pdf
    • https://xufujume.weebly.com/uploads/1/3/4/8/134851049/5be528d4189.pdf
    • https://dudixugodibemuf.weebly.com/uploads/1/3/1/4/131406925/3d8ad63.pdf
    • https://dubebonu.weebly.com/uploads/1/3/0/8/130874554/3050666.pdf
    • https://kazanuwe.weebly.com/uploads/1/3/2/6/132683097/c170b00013c3b.pdf
    • https://gogabaxada.weebly.com/uploads/1/3/4/8/134852864/172c6c5ac3a.pdf
    • http://megalit-korolev.ru/geo_book3_laptop_review7tx8f.pdf
    • http://sdfafq.info/what_is_a_call_to_action_in_englishijsm3.pdf
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/2a314cbb00eb20.pdf
    • https://nipujari.weebly.com/uploads/1/3/1/3/131384055/26300c4883f2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/woneketelak/poulan_pro_5020_chain.pdf
    • https://s3.amazonaws.com/zukogi/wipezomomuji.pdf
    • https://s3.amazonaws.com/leteraxewe/mary_shelleys_frankenstein_1994_full_movie_download.pdf
    • https://s3.amazonaws.com/xovajukoxin/katesukavozeremifosi.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_off0000fb70.bin
00b564eef16510c8900d5737a209f3dfe83decae73b8d8bc926f655dbfd92907
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB70 22212 bytes
font_01_sfnt_off00014192.bin
78cbd89dffbc1549d3172c9e0fdd68f1b368fb1e6e78ba458729863fd7b8e6cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x14192 5288 bytes
font_02_sfnt_off00015396.bin
b2372adb54ef34391b2585ee7c772c7de7d3e440262932394c09d708fa034dda
pdf-font-stream PDF embedded font (sfnt) at offset 0x15396 11300 bytes