Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd8bc58cbfca022…

MALICIOUS

PDF

85.6 KB Created: 2021-05-20 02:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9dd66cc193c1aaf11b7bfaa4b55a9740 SHA-1: e3bcb083f61bdb0e73fc67400b59b01acd37bdd8 SHA-256: 0cd8bc58cbfca0226c9cdaeb8044be39b11ff46863966747b1c751fc5e773524
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gimoguvi.ru/strik?utm_term=manual+telefone+panasonic+kx-tgc220lb PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456398/normal_60654edfa5d0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366952/normal_5fcc37c8be931.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420237/normal_606c60c672b19.pdfIn PDF document text
    • https://buvonage.weebly.com/uploads/1/3/0/9/130969236/dovalurunes-juxotaxogiviwaj.pdfIn PDF document text
    • https://potunajasufa.weebly.com/uploads/1/3/1/3/131381619/fepuxuxaligujavuzal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418764/normal_6018ab64b1214.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407057/normal_6001ca63b37f8.pdfIn PDF document text
    • https://dafubadam.weebly.com/uploads/1/3/0/8/130874240/9968937.pdfIn PDF document text
    • https://nefabilaj.weebly.com/uploads/1/3/1/4/131438225/1204583.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/f0b942a0-7115-4689-b0a3-93d1a23747c4/seloridewijogarabigar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/973411f5-ca5a-4259-8a78-ef0f28b74de3/83707502638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/066492cf-42ad-4172-b663-d8901a2cb23d/oster_electric_roaster_oven_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95e3b0ec-48df-419a-bdc6-e3cf4010ed0b/tone_of_poem_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2ad30be-3df5-4be5-a9a1-d9dc7cb9982a/translating_grandfathers_house_word_choice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc44077-411c-4195-8751-065d1daa094d/kubagis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88fec716-39b9-4374-a456-9f8f1a3ca88a/83513503809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57e6b496-1093-4e02-b80e-31a0ccfb266d/h1_keep_on_the_shadowfell.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/how_does_matter_and_energy_flow_in_an_ecosystem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f68c02e8-2631-4c40-aa24-2f019ea57169/epson_workforce_2630_printer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b78c63c2-fb81-4270-bf0e-e80bf64a85ab/kawasaki_440_aircraft_engine_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/misaworexewopi.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/pinaronumafinozomuxijeve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d49b570d-6d7f-4141-b856-28955cae17bf/is_the_movie_the_secret_on_netflix.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_off000109eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EB 5668 bytes
SHA-256: 153d5db0bfba6ac8d0385163595cdd7ab8197f73b9dd270bde11a012fb1c571e
font_01_sfnt_off00011d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6F 13812 bytes
SHA-256: 9f09e2b21a519d7cab8feb5f7b19ce905e65d66d13d087f24b02739e25b991f2

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