Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a67940c091f8607…

MALICIOUS

PDF

84.2 KB Created: 2021-03-08 15:02:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 78f5502e41fec5f322d2093c4bc84eb7 SHA-1: 580ad0c123aba90e47fff22993536445962cb88c SHA-256: 1a67940c091f86079ca730ea16d0dad2f43007aa802eb70553c40afaa1c5b4e6
134 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating it is a link farm on disposable hosting, with a specific external URI pointing to 'fokemale.ru'. This URL is presented as a download link for English grammar resources, which is a common lure for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious, and ClamAV also detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fokemale.ru/strik?utm_term=english+grammar+full+pdf+free+download PDF link annotation
    • https://lalurarejodu.weebly.com/uploads/1/3/5/2/135297054/8934059.pdfIn PDF document text
    • https://rofoxanubojinud.weebly.com/uploads/1/3/2/7/132740779/virirujudotataw-xugosox.pdfIn PDF document text
    • https://niwifexugebap.weebly.com/uploads/1/3/5/3/135316215/kikiwo.pdfIn PDF document text
    • http://newuwedeza.mypressonline.com/how_to_cut_triangles_for_pigs_in_a_blanket.pdfIn PDF document text
    • http://delinapod.mypressonline.com/95065369068.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/d020162e-a3b3-405d-8859-be3c1a67c843/havoc_brothers_song_lyrics_kadhali.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/whatsapp_versi_android_2._3_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d37a02e1-de14-4c6f-a7f8-2fd4533c236b/kuwud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/492f9147-6a27-4e6e-9d32-fafceb3ac3d9/infinity_gauntlet_cake_tutorial.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/free_subject_and_predicate_worksheets_for_6th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39df81ec-1096-4c7b-b202-047961e3e803/story_of_the_other_wise_man.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/11045443602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80240ea7-7d15-4057-8bbd-87c0fff01526/imusa_pressure_cooker_4.2_qt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/504bc498-ed91-4742-bcea-1f08fa22b167/classical_guitar_string_gauge_order.pdfIn PDF document text
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_b5428735d5754dd6a052713844e729a4.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_e0432f4f218e4ee6babb7128815ff1f2.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE925 5504 bytes
SHA-256: c920ba444fb9b63065d17991bbae9783f52c1fb6d84c1d2345c5957bb8a49431
font_01_sfnt_off0000fbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCD 11012 bytes
SHA-256: 3db0aacbec8e766dc84e57c5251bbd7042a05f3ecda37d957740621f3dc5f689
font_02_sfnt_off00012196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12196 10512 bytes
SHA-256: f5bde1ee25e6dc1a2447903d7564d678f2834a7d26828682671fb6ed96aa09b7

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