Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fcf6a685889cf74…

MALICIOUS

PDF

91.0 KB Created: 2021-05-24 14:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cfe093ef4b06ba52af966e6ea381fe1 SHA-1: 2f7f7a5ce5d2f041531d256c5ac083444a8a86b8 SHA-256: 3fcf6a685889cf741406237abd287a3a2fcfd915d7ac437e3ec0c3de14ec88f8
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier also flag this file as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of numerous external links suggests an attempt to redirect users to malicious or deceptive websites, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/strik?utm_term=how+to+make+custom+message+tones+for+iphone
    • https://cdn-cms.f-static.net/uploads/4380213/normal_605df5b86848d.pdf
    • https://fezimadi.weebly.com/uploads/1/3/4/4/134487715/b1141198c6f4.pdf
    • https://cdn-cms.f-static.net/uploads/4418370/normal_5fd9d60b24b78.pdf
    • https://kerawidirara.weebly.com/uploads/1/3/4/7/134746453/4a50735d222e3.pdf
    • https://static.s123-cdn-static.com/uploads/4447434/normal_5ffe6bcd60562.pdf
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/zagutivezo.pdf
    • https://pidakulosa.weebly.com/uploads/1/3/4/3/134391257/gimaworapubupi.pdf
    • https://goluluvofa.weebly.com/uploads/1/3/2/7/132712214/pinivujowa-parudubigova-woxanises.pdf
    • https://cdn-cms.f-static.net/uploads/4405179/normal_60663e5ca7589.pdf
    • https://cdn-cms.f-static.net/uploads/4478131/normal_604fc98ccb372.pdf
    • https://cdn-cms.f-static.net/uploads/4470028/normal_605dae47d9239.pdf
    • https://cdn-cms.f-static.net/uploads/4387702/normal_5fd1c0b25371a.pdf
    • https://tubidurifubadas.weebly.com/uploads/1/3/4/8/134885002/2827869.pdf
    • https://zatitobeme.weebly.com/uploads/1/3/4/0/134097178/6780556.pdf
    • https://mibofadap.weebly.com/uploads/1/3/1/6/131637701/vudatarazewa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1327b131-2ec5-414a-a1ac-00e9ce684a91/easy_piano_music_free_printable.pdf
    • https://uploads.strikinglycdn.com/files/c8258b5b-a659-447a-9152-f5ec3fbafc3e/16584387992.pdf
    • https://uploads.strikinglycdn.com/files/aebd9921-b44d-4269-b481-d74b909f01db/chapter_5_test_form_g_algebra_2_answers.pdf
    • https://uploads.strikinglycdn.com/files/d13242a7-5f49-4bc7-85d8-bd63dbb42514/know_why_you_believe_audiobook.pdf
    • https://uploads.strikinglycdn.com/files/2cb40229-0c30-48d3-882c-9af07724e260/junot.pdf
    • https://uploads.strikinglycdn.com/files/f474d5cb-8372-4057-b54a-c8e764e903fa/can_you_join_the_military_with_no_teeth.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f882.bin
605fbe8a0b9fed6bfc1ffb9604b910f8e4296aa1fbb3045e6c0c2159e3f97d04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 5396 bytes
font_01_sfnt_off00010abd.bin
7f38c7bd3076d5ec567b373f8788658f617417f44aeaffad1c2d563936ecbb0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABD 2268 bytes
font_02_sfnt_off000114cd.bin
66cc3d06c6a484e61dfcf7fd398b2ecd193d6832a15c1e4e449be3b3b97a98ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114CD 10844 bytes
font_03_sfnt_off00013a2d.bin
95f2a8319533f051e584a9e2aa38e8d42f7eb419abe795cf0dce2d6390e2c0a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2D 16204 bytes
font_04_sfnt_off00014f5f.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F5F 4324 bytes

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