Malicious PDF — malware analysis report

Static analysis result for SHA-256 171113d58c34183e…

MALICIOUS

PDF

78.9 KB Created: 2021-04-06 06:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea3ba50d1f05446ac1339b040b1eff76 SHA-1: 4439dfa8945cccab14f2d637ae078979b3a19bb2 SHA-256: 171113d58c34183e0ce0960d5ce2d84050f8ee7881f82c077d2f7d7619aa6f3c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The document body, though heavily obfuscated, contains text related to 'poem lyrics' and 'wkhtmltopdf', suggesting a lure. The presence of multiple unknown reputation URLs, including one at 'ponafet.ru', indicates a potential phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=the+night+before+xmas+poem+lyrics
    • http://momexatajuma.22web.org/80659613376.pdf
    • http://eurostore.info/85817932024f29k1.pdf
    • http://xtreme-sport.ru/what_does_99_year_leasehold_mean_singaporeyukge.pdf
    • http://varesazu.22web.org/30735861499.pdf
    • http://reduslim-buy.site/7820248256419mbe.pdf
    • https://zevebijupaxize.weebly.com/uploads/1/3/4/7/134754497/guvewoxetew.pdf
    • https://bezugoro.weebly.com/uploads/1/3/4/6/134697972/xagujo.pdf
    • https://pugixodazujok.weebly.com/uploads/1/3/2/7/132710779/551722.pdf
    • http://ximuvitu.iblogger.org/gastroenteritis_bacteriana_aguda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f6a16203-cc4e-4205-89f6-0349f8aed98a/63029270298.pdf
    • https://467375c7-a7a6-4806-a9b7-892c2a528f89.filesusr.com/ugd/911174_d682d75b5a8940dcab40b1416837700d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/438e6250-2153-4099-8458-ed228ce71740/how_do_i_reset_my_samsung_s8_back_to_factory_settings.pdf
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_94a18dd84021414aa01e0fbb776c6b8b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/980cadd9-9152-49ab-a7a5-0f6d94fca8b5/xinoxo.pdf
    • https://uploads.strikinglycdn.com/files/9a1f1938-ccfe-4857-90dd-a0a6b6117276/zebusogufimotuxobuj.pdf
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_5d41a3613ceb4369a9e7736a0d3db1c0.pdf?index=true
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_defec4d753684156b3e9ccd46f5b418a.pdf?index=true
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_435a45d7f95e428cb283bde33ca4afe2.pdf?index=true
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_bcfbd4be8afa488fa137f665d998aab5.pdf?index=true
    • https://baad1762-ad72-434c-be9a-9de7d8068d01.filesusr.com/ugd/61395f_44f136a8ec414ea79ca5e7bad4d70ceb.pdf?index=true
    • https://0dc5fd1c-b354-4e5b-9ccd-45395e8994ed.filesusr.com/ugd/f79e8d_dd734ff22471414188a43d72c357c711.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_off0000f592.bin
439391d4966e14c2503ac7d8930113891b29d3c2c4a17aa41df677ee8658dad0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 5688 bytes
font_01_sfnt_off000108d3.bin
0827ccceb405c7fcaa31bd51e6a4ed80fd84d625d4bea68f9a4009a0a17436f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 11024 bytes

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