Malicious PDF — malware analysis report

Static analysis result for SHA-256 176ebd0b8c87f608…

MALICIOUS

PDF

88.9 KB Created: 2021-05-22 14:39:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ab7d39de57367bfa68a5754168019b6c SHA-1: 9731e3d694a586d3abe3cac4fff00ba03d6d0cb5 SHA-256: 176ebd0b8c87f608b6a9c00328c13824cc026e304bb368459b6a94d0f39d9911
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or SEO abuse. The presence of embedded JavaScript, though not directly executed in this static analysis, suggests potential for further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/strik?utm_term=clicker+heroes+new+game+save PDF link annotation
    • https://gibejuta.weebly.com/uploads/1/3/0/7/130776113/d3336bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403129/normal_60466a36893e5.pdfIn PDF document text
    • https://jososipiwudamuw.weebly.com/uploads/1/3/2/7/132740918/xotofijegajipo-wilerepavut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393018/normal_6003d041954e2.pdfIn PDF document text
    • https://jenodefutufute.weebly.com/uploads/1/3/4/3/134373351/14154.pdfIn PDF document text
    • https://xifupanudolegu.weebly.com/uploads/1/3/1/1/131164204/d6b2f4e08.pdfIn PDF document text
    • https://sozuxope.weebly.com/uploads/1/3/4/8/134873608/5914859.pdfIn PDF document text
    • https://ponekuxu.weebly.com/uploads/1/3/4/7/134747949/7b4f2622e.pdfIn PDF document text
    • https://revogofoti.weebly.com/uploads/1/3/3/9/133999152/bec45e.pdfIn PDF document text
    • https://zegesunipatobas.weebly.com/uploads/1/3/1/3/131379774/luminiwubidaliv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6c0e19dc-ea09-4658-8e91-226267f0eb52/fujitsu_halcyon_light_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c6c4cbe-70a9-45a9-8f54-788aafefa078/food_safety_law.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9986e9a7-6abd-4645-99bf-7107a4d7f05d/87425384828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/007d3fa5-2d4f-4ef5-88fd-97b852ed2927/fitatololasamopuzor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6fa3e7e-7984-46bb-b32d-498479165ff0/jiboruxurijed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bc97e42-ee96-4d66-9339-210ba40aeace/xosinoze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca383a10-0a2a-469c-aecd-e1f8e321291a/huffy_bikes_24_inch_cruiser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d4dd41f-d887-4e82-9f40-6fdf3d04d22a/supedusabidoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cb84929-edd8-4fd8-a1ef-c3f08f8a52eb/christmas_math_puzzles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98139fa9-6573-4602-926b-40c822e07238/list_of_english_literature_authors_and_their_works.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d3ba594-c802-4cdc-b61f-a172eb541c10/20274338632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/825d2244-dafb-484a-b671-f391274aeda3/pop_fake_book_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba8a6bda-9dbb-4c31-86a7-36b540570af0/intensive_pronoun_worksheet_with_answer_key.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F80 5160 bytes
SHA-256: cd5d98f55d70f66a2e6e4d67478b887c020a08bd90613d6efd0f47533019a746
font_01_sfnt_off000120e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E1 11004 bytes
SHA-256: 30b6fa333bdc5dce56fa9917d44e960bb2ed34abcb2a4328d4d4decf20bd26f8
font_02_sfnt_off00014677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14677 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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