Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efdcc293068cdeb…

MALICIOUS

PDF

79.3 KB Created: 2021-03-15 05:57:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 49be5a99e9d23cc1e16e10013767d0c8 SHA-1: f1b993346eb788a7aa2db5342aebec88a59f91d6 SHA-256: 8efdcc293068cdeb6f778f36e4238913930df2d89d72f34e48b67a17953ef872
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs and the PDF structure point towards an attempt to redirect users to potentially harmful websites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://druttle.ru/strik?utm_term=blue+is+the+warmest+color+book PDF link annotation
    • https://fafafavavilaba.weebly.com/uploads/1/3/4/8/134893162/480b4b162c4.pdfIn PDF document text
    • https://bususofewibuju.weebly.com/uploads/1/3/5/3/135329568/jumul.pdfIn PDF document text
    • http://faceit.su/lugosumutosakodatheoab.pdfIn PDF document text
    • http://olx-delivery.cc/harry_potter_1_cast_oliver_woodg82bn.pdfIn PDF document text
    • http://alcexpress3.xyz/activex_component_cant_create_object_sap_gui21pje.pdfIn PDF document text
    • https://wobakasufafe.weebly.com/uploads/1/3/2/6/132682589/6a43f127.pdfIn PDF document text
    • http://bitoxifa.sportsontheweb.net/castrol_edge_5w_30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389809/normal_60366679163e6.pdfIn PDF document text
    • https://mobajexiv.weebly.com/uploads/1/3/4/4/134455683/zedexexob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416305/normal_602ed30a6cfc2.pdfIn PDF document text
    • http://dabukim.mygamesonline.org/murepuwofokunuwasivetifu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387573/normal_600e620a465d0.pdfIn PDF document text
    • http://biotringel.shop/do_professional_chefs_use_electric_knife_sharpenerso7ftd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477401/normal_601dd742a90b2.pdfIn PDF document text
    • http://gebevojika.mygamesonline.org/wopafi.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/understanding_food_principles_and_preparation_6th_edition_free.pdfIn PDF document text
    • http://operationhomeplate.com/how_to_change_ink_canon_pixma_e470dn7ez.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/e1b63c4d-30f6-4ea8-8e29-5a24b1186d8b/87669130275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a7db1e0-d075-4b12-ae20-7c1221c7c0d4/propaganda_edward_bernays.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9d10fbb-7b25-42c3-a578-e4a4207c8268/moto_g7_play_user_guide.pdfIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_1c9246af48664544b3ce62f8e2895f2b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3ea162e-72f3-4e36-9c34-395ae9b1f498/is_student_driver_permit_a_valid_id.pdfIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_90718b61c3f94c35990e4d76ee73aaa6.pdf?index=trueIn PDF document text
    • https://77ac2d45-d533-4b4b-a85c-01e81860bff9.filesusr.com/ugd/7f1ad7_f1b2d1d8b5c14d01825ef17e5b952db2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0c27acb-1ec5-474a-941d-19889eeaf696/fabivoladabaleminu.pdfIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_3c5fb04940db457d95351325ef1b5ae4.pdf?index=trueIn PDF document text
    • http://gipebevu.atwebpages.com/drunvalo_melchizedek_ancient_secret_of_the_flower_of_life.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_off0000f70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70C 5384 bytes
SHA-256: 25cbe34600a9261ac49b5cfe5087971770b1f299e89c9aa7399c2863e266a211
font_01_sfnt_off00010945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10945 10712 bytes
SHA-256: 40d5758bf258c76c49db02b73b1ae566fa44c002f496d8d0adc1d5a5de7b3cc5