Malicious PDF — malware analysis report

Static analysis result for SHA-256 9158b7a8deea5306…

MALICIOUS

PDF

89.3 KB Created: 2021-06-06 14:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 07cda73d97811daee6eabac6fe92ab93 SHA-1: 3ca93af4097b6fff2d83b810e7c14f00c3b0bcf7 SHA-256: 9158b7a8deea53065889aa21702d57ba632615e76bac1071cb79b30ed03d0a96
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to a suspicious domain, likely intended to trick the user into downloading malware disguised as a driver. The PDF structure and embedded links suggest a link farm used for phishing, with the primary malicious link being to 'drafthe.ru'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://drafthe.ru/pbw?utm_term=ati+radeon+x1650+pro+driver+windows+xp+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450519/normal_5ff8dcf700a33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413370/normal_60239c22a5def.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490528/normal_5fd317cfbf0dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379603/normal_605bb3e77217c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505358/normal_60b8b1ffeeaf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471960/normal_5fe618cab56a0.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/7aab3515-a5d3-4c5b-ba38-673ca2eec647/how_to_write_an_introduction_paragraph_for_an_essay_about_yourself.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cb44b92-e986-4599-98ad-9320b979e395/89778721907.pdfIn PDF document text
    • http://kuperuxowix.pbworks.com/w/file/fetch/144543543/towufu.pdfIn PDF document text
    • http://rimogeto.pbworks.com/w/file/fetch/144652188/free_knitting_patterns_for_18_dolls_clothes_to_download_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ff82c00-3211-46fb-9ec5-c5f2ab6c8ec6/download_driver_audio_windows_7_32_bit_asus.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/f/potumibugus.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/61008059720.pdfIn PDF document text
    • http://noxiwako.pbworks.com/f/.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/f/cpt_code_for_ct_guided_biopsy_of_soft_tissue_mass.pdfIn PDF document text
    • http://farejutotej.pbworks.com/w/file/fetch/144685071/witeta.pdfIn PDF document text
    • http://pifiloxema.pbworks.com/w/file/fetch/144689409/how_to_clean_a_keurig_2.0_coffee_machine.pdfIn PDF document text
    • http://vawijoj.pbworks.com/f/kevinubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80af0d8b-6402-40d4-993b-902e5d90781c/poems_about_play_board_games_with_friends.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/f/vilisumoj.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_off000119ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EC 5632 bytes
SHA-256: 7293c3db4b156f1511459f2d3911c46556a8528bd4c15b8dcc56a4c48fb61491
font_01_sfnt_off00012d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D42 13304 bytes
SHA-256: 8a95198fd8c19f54b09c5f8567a4cf2378a4325d4844ed822ef1ed4319b71045

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