Malicious PDF — malware analysis report

Static analysis result for SHA-256 04df8659b641c6e1…

MALICIOUS

PDF

80.0 KB Created: 2021-03-17 16:54:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cadf114b5ceb8066d8d8abb83e7f0083 SHA-1: 2885a5518a5584b45b558ab89632aafdb0056d4c SHA-256: 04df8659b641c6e12d475e48a44c48bb000d4ae933ef0c3f9a9d7beb569b2cb8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are flagged as unknown or potentially malicious, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a social engineering attack designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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/123?utm_term=jingle+bells+piano+sheet+easy
    • http://awpmode.com/74981276552acz77.pdf
    • http://granitmetrospecstroy.ru/arkham_horror_rules_reference5vcsi.pdf
    • https://cdn.sqhk.co/vidujubotaf/fkje6ha/zogidobomojotidiguna.pdf
    • https://cdn.sqhk.co/moserusoba/epAKJ89/during_the_marketing_concept_era.pdf
    • https://cdn.sqhk.co/kinubowa/ijiehjw/super_sonic_sprite_gif.pdf
    • http://brumbum2.xyz/negebogezitopoa9uu1.pdf
    • https://cdn.sqhk.co/nozelenid/iJgeBgi/sdg_5_goals_and_targets.pdf
    • http://mutujejeturuduf.medianewsonline.com/17897368050.pdf
    • http://glawerry.online/selumujebavimuxuteu4aa4.pdf
    • http://select-get.top/jabolamivotijokeduwex3azw.pdf
    • http://kizunawinim.getenjoyment.net/95731459720.pdf
    • https://cdn.sqhk.co/bovokolel/5J848hd/vaxejivoxopu.pdf
    • http://intereriia.com/what_are_the_i_iv_and_v_chordsrppsv.pdf
    • http://gekifek.scienceontheweb.net/physiology_of_smooth_muscle_contraction.pdf
    • http://suvuxivenorum.mypressonline.com/harry_potter_books_in_spanish_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_61b925e2e8de4a1dabea34e85056b7a8.pdf?index=true
    • https://a909b8fe-7c6e-4467-a5b6-92e64a2a5b5d.filesusr.com/ugd/65efca_302e39b5795745b2ac4f6a24b5143d62.pdf?index=true
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_aff2521701c04f819abc6ce3c82c38fc.pdf?index=true
    • https://3b9c8e93-52ab-41e8-96f8-e5fc639bf6fa.filesusr.com/ugd/fe3ccd_d24e5bdd21664aa5a6abae212c2ceeec.pdf?index=true
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_b4d812a74aaf41d4a26b0d7b1c082815.pdf?index=true
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_a5289338ca33472a9b6aa1c36856bc63.pdf?index=true
    • http://nakarajibap.myartsonline.com/tiu_thuyt_toeic_benzen.pdf
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_68e7339bfe754c31a77bf533890f58dd.pdf?index=true
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_0ed4caa7e6fa4f54aab262d0d2b52a9a.pdf?index=true
    • https://5563968e-3cf5-463b-8312-7915ab8a4794.filesusr.com/ugd/cd90d1_8929164f55c143d19b46437b22f2c68a.pdf?index=true
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_bbdb4c38f5bd46b79bdf5371a00efc42.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_off0000fa01.bin
98c07b24d7cdec832003322fc4dcf00391ffbf27e9314d2237efd35131696d02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA01 5216 bytes
font_01_sfnt_off00010bc3.bin
9fbf3895904f9b53c90267363399c8670b219f81f3fec63f731342f31b435ffa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC3 11548 bytes

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