Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6113c5066594ec…

MALICIOUS

PDF

73.7 KB Created: 2021-06-04 13:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 10ca093333be4ee3ae313d300174cf28 SHA-1: 520564679031e241978f7c7df04a6f298d92aec7 SHA-256: 8a6113c5066594ec39f8896bd0357ed28ed1ba724dd13ec093b8a7679ac84870
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains an external URI pointing to 'crewmak.ru', which is likely part of a phishing or malware distribution scheme. The document's structure and embedded links suggest it is designed to deceive users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crewmak.ru/pbw?utm_term=carti+audio+engleza+incepatori PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4498330/normal_60094fadb774f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403560/normal_5fc7c24eb21b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454040/normal_6019d923c2064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446762/normal_6063b1b983d35.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/54c2ac38-727e-4e91-9e6e-92e6f04e8b2f/76322299282.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/f/47792496594.pdfIn PDF document text
    • http://magobok.pbworks.com/w/file/fetch/144496800/78305824140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4db3374-258a-4f33-8993-79938a9ffc6b/61747808348.pdfIn PDF document text
    • http://foziwedugumu.pbworks.com/f/how_to_properly_clean_humidifier_filter.pdfIn PDF document text
    • http://savavaze.pbworks.com/f/romeo_and_juliet_unit_packet_answers.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/f/tinuferuxumasikejurexi.pdfIn PDF document text
    • http://vibevekofano.pbworks.com/f/what_are_some_advantages_of_asexual_reproduction_over_sexual_reproduction_brainly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/158e7200-9e08-4e75-bcf6-1cc39e19792b/fijimeveti.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/f/is_the_inheritance_cycle_good.pdfIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144487614/dynamics_ax_365_tutorial.pdfIn PDF document text
    • http://risoxef.pbworks.com/f/revapivoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abbd9cfc-e167-4345-9506-3d84cde617df/pronunciation_games_hancock_download.pdfIn PDF document text
    • http://sajateves.pbworks.com/f/xoxanezakebuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a2c1d8d-8172-463b-966c-58418a0545c2/27769765500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f306c60e-a48a-4db1-8fe4-b50aa53d9f34/why_is_a_spotted_lanternfly_dangerous.pdfIn PDF document text
    • http://ronefete.pbworks.com/w/file/fetch/144486147/petexir.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_off0000e333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 5016 bytes
SHA-256: 548499e0e343726b0cacf7aad5280752226fe7e30b2022aa54410bef9d819e2d
font_01_sfnt_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 11452 bytes
SHA-256: 4c6c9674a24d68c8beb2f0e20d035f566130cc81eed394d01c395426089e017e

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