Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf4cd1e4a9cdd67…

MALICIOUS

PDF

77.2 KB Created: 2021-04-15 13:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 57fbc1e61e9246849f0b3a0c2b8c72d4 SHA-1: 59a105ba49e04fc27dfff486936e3620aea9bbc7 SHA-256: 6cf4cd1e4a9cdd67262c38f168b7e12205e3376bd431ecd1a48e754fa48ccf87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://maypoin.ru/strik?utm_term=how+money+works+the+facts+visually+explained+%2528how+things+work%2529+pdf PDF link annotation
    • http://zibepifutidi.sportsontheweb.net/51236952770.pdfIn PDF document text
    • http://gmetry.online/whirlpool_india_refrigerator_spare_partszvprr.pdfIn PDF document text
    • http://edevletorg.com/mapiranomasa6fw2f.pdfIn PDF document text
    • http://zifeladawu.scienceontheweb.net/wowotigaxujap.pdfIn PDF document text
    • http://arnautmebel.ru/48263863656xleza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_db6de9932df34cedadd496ed1af4e83a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed484818-8a72-485b-83f8-69806d816958/the_birds_nest_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/080d55ac-9939-48fb-9bd3-fedee45137d8/filter_for_samsung_refrigerator_rf28hmedbsr.pdfIn PDF document text
    • http://limoxukuk.atwebpages.com/45909512038.pdfIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_ae2d5bf8195c4604a5b93affbb9ec160.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e40e7a3-f0c0-4491-93a8-a55d7bad5372/wirujetexiwovifuxafez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bb025fd-ed6b-4fa2-a7ac-d835c44d07a4/information_technology_def_english.pdfIn PDF document text
    • http://nupuzawov.onlinewebshop.net/pivavokez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b84cdee4-c3c8-4bfe-bf56-37e9de3829be/schwinn_-_270_recumbent_exercise_bike_-_black.pdfIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_fea6b12d6ceb44e1a558ec2f8dee7fde.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f754f44-ea5c-45c6-ae39-e367abc95d6d/yamaha_receiver_rx-v677_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f16a66f8-d2fe-4efb-adb6-020c86420e50/13137901313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f15d40-dfd5-4c27-a0e4-f2acd38dea42/wovivupobipuwobadigeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5c428bc-20fe-4fa4-bed5-0f56cb7d94fd/45765501296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14d46d5b-cfc4-4fed-a8b3-f3d77dce3419/64421394296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38fb9b8c-17aa-42c8-bc7a-e0c6c3927c80/zupobe.pdfIn PDF document text
    • http://xekapakifujekem.onlinewebshop.net/72786831309.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c93205aa-e913-4df4-8899-fc2f55e5d304/51135886914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8f7fd78-db72-4e58-a0f2-2cc02c5880c0/what_does_god_mean_i_am_who_i_am.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_off0000eac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 6072 bytes
SHA-256: 7c51c858c7ae69f654aafe43f38acbfb6ddc3be8eca1c5af56894cc2b5a5bec2
font_01_sfnt_off0000ff7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 10800 bytes
SHA-256: a8a816e4b6239d84f5052d382d6ac87745101080d10c76c7a42ba7997be99eba