Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c59641d61f186f5…

MALICIOUS

PDF

83.6 KB Created: 2021-03-10 19:56:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b583bc1ebdba633e5648c64b2b20b983 SHA-1: 96956ae607c33999e3339e486f1a3e57d2cfdeac SHA-256: 6c59641d61f186f5517b1be02cbb3ca580ad7d584f474afac47099e6cc8030cc
166 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, with one heuristic specifically identifying a link to an algorithmically-generated URL on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, suggests a lure related to 'printable taboo game cards free'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://bologen.ru/strik?utm_term=printable+taboo+game+cards+free PDF link annotation
    • http://khanapoorti.com/calamity_mod_slime_god_guide6v0a0.pdfIn PDF document text
    • https://mujabimebedegi.weebly.com/uploads/1/3/4/2/134234846/22c3ea726.pdfIn PDF document text
    • http://remastacer.com/what_is_the_best_self_tanner9thld.pdfIn PDF document text
    • https://latimemoniborij.weebly.com/uploads/1/3/1/4/131437487/nurajegoti.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/jevokevujusinufakijurolubnyisv.pdfIn PDF document text
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/f0413c.pdfIn PDF document text
    • http://tekdouche.xyz/38449389075l7vp4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471960/normal_5fd09cdf5c5a6.pdfIn PDF document text
    • https://galixasuja.weebly.com/uploads/1/3/4/5/134518214/kitawe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379960/normal_6044cd59aa26a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444877/normal_5fc7e4f400029.pdfIn PDF document text
    • http://7lessons.space/7065278838o2g7m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c106c2dc-c595-4b6f-b273-03a72e019dc2/samsung_xpress_c460fw_wireless_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e3ef013-61cf-4a20-84d5-948b9e3a8c3f/74176443617.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/3527567670.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/ge_advantium_120_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/vawozuloboxam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3854c455-2438-4cbd-a3be-d398445b5893/demipigam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2a7e44f-d812-437e-b915-721f9c416feb/environmental_ethics_definition_geography.pdfIn PDF document text
    • https://dc3b6686-5ec8-4f9e-b140-4b8929053b40.filesusr.com/ugd/94e5ef_4d6f614bbf7b40bbb304dc287e5a8989.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0c74c85-c2ac-4ea8-b83c-9e6a6929b2ba/foundations_of_finance_8th_edition.pdfIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_36e5c94d0729429482507df60425b5ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zubata/loan_cancellation_email_format.pdfIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_9e4db47c783249e2be063f0d92c1dafb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/gfr_calculator_for_pc.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4B 5484 bytes
SHA-256: 8da9a6c1ff940dfeae5c11cf45a6b505b9a2f1e9851c74533780f207ffea0b38
font_01_sfnt_off00011cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD7 10532 bytes
SHA-256: 03af366e863bcb92af3f9dd376dc9dede00a2d4dbfb42deeda9626b29b4a74bc