Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac0a12be394be80…

MALICIOUS

PDF

83.9 KB Created: 2021-04-04 13:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 31a38d67f47ada271c19a289351a5c89 SHA-1: 08432cc415ccf71a316649fecc4e66af2d64d02c SHA-256: fac0a12be394be803dfa027b90f0345d77f3e3a059940157b8adec7623f725f4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded content, though heavily obfuscated, likely serves to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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.
  • 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://druttle.ru/123?utm_term=multivariate+regression+analysis+pdf PDF link annotation
    • https://wirejosesem.weebly.com/uploads/1/3/1/8/131856641/304120.pdfIn PDF document text
    • https://bunepefetupudir.weebly.com/uploads/1/3/2/7/132741430/rajivor.pdfIn PDF document text
    • https://gukozorupo.weebly.com/uploads/1/3/1/4/131411088/bikosuvamakabu.pdfIn PDF document text
    • http://atomyimperial.ru/free_printable_holiday_taboo_cardsbiyz7.pdfIn PDF document text
    • http://vehicleusains.com/doseramovyshkj.pdfIn PDF document text
    • https://cdn.sqhk.co/pobopuwubox/7WZjeis/best_blues_music_near_me.pdfIn PDF document text
    • https://movireralu.weebly.com/uploads/1/3/4/8/134879142/lefonokug.pdfIn PDF document text
    • https://cdn.sqhk.co/rubogomuweme/BjbigDP/a_certification_study_guide_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/rowemarul/sYZjfqF/ravagipipapamanizewum.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/1jige5p/15887890480.pdfIn PDF document text
    • https://tulalesin.weebly.com/uploads/1/3/4/8/134876190/mesugo.pdfIn PDF document text
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/102236.pdfIn PDF document text
    • https://wujowaditufoko.weebly.com/uploads/1/3/4/6/134696314/5365876.pdfIn PDF document text
    • http://55571.ru/99098234020ir58y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_91b50ae060244b998bd331b1c8305aa6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/73e0a8ec-d832-4716-a9d0-1b2b90e05991/how_to_bypass_parking_brake_wire_on_pioneer_avh-1300nex.pdfIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_419417626a9f4bb5b8c2975d19c0e0e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93e2dcfe-20ee-4898-9e75-109fff42edfe/big_star_quilt_block_tutorial.pdfIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_b4248c2d71b640ea826739a6899bab76.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/345028da-574b-4f1a-8676-d4e226fda368/wedib.pdfIn PDF document text
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_842f9e2afada46df9d11b935cf75b64b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/59ce32f2-7a50-4484-94e8-50839e0f55f5/technicolor_tc8305_manual.pdfIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_4841be140750449d8be739a523561207.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE785 5376 bytes
SHA-256: e59c4afc339f059a8bbe87a42934f34c80031afb2a88d24178a8c75ea02aa4fe
font_01_sfnt_off0000f9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F8 2172 bytes
SHA-256: 6d9044e88a600f55c2b8799f62b522751254ce0b91e35f70fc2ebfe1dc71f479
font_02_sfnt_off00010359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 11964 bytes
SHA-256: ddfa93ae264ba85b974e5385d4219e4e4381ea9402f673d75a72319331e31a14
font_03_sfnt_off00012c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C22 16148 bytes
SHA-256: 49436f94d5abf10ca6af8af9848174aab82dfe7bc58a5146411d238fd5c76648

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