Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda3bf829fb1c8c2…

MALICIOUS

PDF

78.5 KB Created: 2021-03-07 23:56:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c3ea76118658964f333a3c395e0adfc SHA-1: eb9a4e5bdd02d21433e03fa0a4bbb6a7a1e10535 SHA-256: fda3bf829fb1c8c2dbf500512e9568fc26d248e0359e9753dc390a9110abbb29
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm attack. The document body, though heavily obfuscated, suggests a lure related to a 'gold guide'. The presence of numerous external links, including a large PDF link farm, indicates an attempt to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users through malicious links.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/wix?keyword=tbc+jewelcrafting+gold+guide
    • https://cdn.sqhk.co/fexiseme/jggjiiR/kuwokibufetobejekegu.pdf
    • https://tesegedoveveda.weebly.com/uploads/1/3/4/8/134891870/fuzojov.pdf
    • http://sitebomobegux.sportsontheweb.net/who_did_sue_bryce_married.pdf
    • https://felinabaf.weebly.com/uploads/1/3/4/3/134380667/wulatoraxiguwe-zisezowiguwuz-lipipenasopazi.pdf
    • https://cdn.sqhk.co/jivonaxadu/eNNiaid/toxuneninuporurodoxutedox.pdf
    • https://cdn.sqhk.co/gemadaruvow/EjgOeij/23103093331.pdf
    • https://cdn.sqhk.co/gotofebelu/7ge9Psv/fiwagafala.pdf
    • http://zaxevef.getenjoyment.net/31984078842.pdf
    • https://cdn.sqhk.co/tatidukigag/hX0xLic/panzer_force_2020.pdf
    • https://cdn.sqhk.co/parabeset/gjoFXgg/65679037795.pdf
    • https://vawudida.weebly.com/uploads/1/3/4/8/134890241/vupedivin.pdf
    • https://cdn.sqhk.co/vadafepagij/fAj7iia/shake_shake_shake_song_from_beetlejuice.pdf
    • https://cdn.sqhk.co/bogovureg/gVhbigr/30792142624.pdf
    • https://cdn.sqhk.co/tokititagiwe/Bja4xjj/how_do_you_escape_hello_neighbor_s_house.pdf
    • https://cdn.sqhk.co/tenerinirik/fEjiigK/sobufegavaxis.pdf
    • https://cdn.sqhk.co/dugubupa/jh2Z5Rj/36804854505.pdf
    • https://cdn.sqhk.co/defisepeniba/dHjKGic/best_makeup_routine_for_mature_skin.pdf
    • https://cdn.sqhk.co/wabogoga/bU9NeBD/easter_worship_songs_2020_chords.pdf
    • http://fotubobuwenapu.scienceontheweb.net/tomeze.pdf
    • https://cdn.sqhk.co/notenirikev/gcEgjLS/nuwaxiparawugowe.pdf
    • https://cdn.sqhk.co/nemuvefik/a6iieRo/63510050947.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://penanaras.myartsonline.com/ryobi_10_amp_7-1_4-inch_mitre_saw_canada.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_off0000e80f.bin
5ea0bd806d4279219a63f05eb086266482e828f5bc537b77df194145a0142821		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 5148 bytes
font_01_sfnt_off0000f9ab.bin
c2a35d5584cabcf644776f22acf2fe5b294060bff817fd981aedb16e071b98d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AB 10608 bytes
font_02_sfnt_off00011de3.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE3 4324 bytes

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