Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe8eec8badc9ec2…

MALICIOUS

PDF

73.0 KB Created: 2021-03-06 19:13:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bdd8f43759d82f9515b5e74d603a151 SHA-1: 50d5b75e120fada83dacdca57202f585b2a46ae2 SHA-256: dfe8eec8badc9ec22cd9d1877babfc638f3c509ccdfe9fe999bf3310ff217ec0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous external links, indicating a link farm or phishing attempt. The PDF_SEO_LINK_FARM heuristic specifically points to a large number of external links, suggesting an attempt to drive traffic to malicious sites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the presence of external URLs strongly suggests a malicious intent to redirect the user.

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://soxebez.ru/wix?keyword=picket+fence+federalism+added+the+element+of
    • https://cdn.sqhk.co/soziwariru/HgiNUgc/30745643111.pdf
    • http://pazujiz.mygamesonline.org/82154803242.pdf
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/nosomarakefigav-xeriso-jisibot.pdf
    • http://com-servers.online/maps._me_offline_maps_travel_guides_navigationn6rcx.pdf
    • http://madoxorijegobe.sportsontheweb.net/zozidosas.pdf
    • https://lepovomika.weebly.com/uploads/1/3/4/7/134701686/acd4ef7106b.pdf
    • http://gemubanabugawa.mypressonline.com/favemoxobes.pdf
    • http://meetporte.xyz/50341118176ow5im.pdf
    • https://cdn.sqhk.co/kibutonap/eOjgYhh/music_quiz_guess_pop_song_90s.pdf
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/7936304.pdf
    • https://munuliwakubife.weebly.com/uploads/1/3/1/6/131637312/4743744.pdf
    • http://meetsalon.xyz/john_deere_44_inch_snowblower_shear_pins0m7e0.pdf
    • http://gexomafe.mypressonline.com/85582296057.pdf
    • http://nanonewe.scienceontheweb.net/beats_solo_3_wireless_release_date.pdf
    • http://vodabutopidaru.getenjoyment.net/kenwood_th-f6a_programming_software.pdf
    • https://xalorato.weebly.com/uploads/1/3/4/3/134317389/gawitege-kusivetatew-fubozuzu.pdf
    • https://kasuvimifimo.weebly.com/uploads/1/3/1/6/131637099/jasoter.pdf
    • https://moluxoket.weebly.com/uploads/1/3/2/6/132682852/ac839596068.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gototura.myartsonline.com/97242105121.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_off0000de88.bin
d76f50bdee01dc9ad04e1ef598db79942987e479681247f89291889ece0dfc3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE88 5328 bytes
font_01_sfnt_off0000f07d.bin
46ff966df9338c958e27514f3546b3aaf38535f6eb993846ca8c156509eaa06a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 11696 bytes

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