Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a7469526a64b85…

MALICIOUS

PDF

77.0 KB Created: 2021-05-30 23:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5052eae45d4536272dcc9b6d4e8b8470 SHA-1: 9aedba32eafd780f7d1074d282daabe5a34fb740 SHA-256: 94a7469526a64b851a213de6b2e16a7c88e49314b0e9e48cd7395c7e4debaa40
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=words+their+way+spelling+assessment+pdf PDF link annotation
    • https://pubodepilup.weebly.com/uploads/1/3/1/4/131406337/nupagunegagob-vadetozoxole-tarubopuzaneki-tewebep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475741/normal_606a512133012.pdfIn PDF document text
    • https://fenatelelopowi.weebly.com/uploads/1/3/4/5/134510159/ac212a9f8dc25.pdfIn PDF document text
    • https://zasufademebarav.weebly.com/uploads/1/3/4/7/134737005/1785863.pdfIn PDF document text
    • https://jivimukik.weebly.com/uploads/1/3/0/7/130775904/7a5dfb176e65a20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485942/normal_5fda1d4ddcc84.pdfIn PDF document text
    • https://bemezonef.weebly.com/uploads/1/3/5/3/135389856/8d900.pdfIn PDF document text
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/e01aa6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490936/normal_6007e40c92ea7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369646/normal_5fc7477feb9a6.pdfIn PDF document text
    • https://bajevopado.weebly.com/uploads/1/3/4/4/134456845/kifesisedaxurewuraxo.pdfIn PDF document text
    • https://pedutiwoda.weebly.com/uploads/1/3/4/4/134481784/9920427.pdfIn PDF document text
    • https://xikiwideb.weebly.com/uploads/1/3/4/7/134730665/mobiwede.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/e9ac0511-70ee-4a74-be1b-3f3e7341fdbe/what_are_adjectives_adverbs_and_verbs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab379c91-5d40-42c9-8caa-60f3c7423b40/kazozirisosomepazadaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3e60ca0-4c65-4021-b96b-af15ebb17565/jawinuloxufidoxamibep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e1ded1-cf7f-4b83-ac13-5f213bfc5285/tissot_t-touch_connect_solar_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d16c9d0-65cb-48dc-995c-5c40093686cc/wamulama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/581c19c0-3480-42f0-8b5a-a0c517e71c05/how_to_do_eye_makeup_black_girl_look_pretty_without.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd7295b2-95c2-4532-aa7e-7018eba2f635/92821380234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/390b8103-974c-4c96-abf8-9728adaa8dfe/complete_list_of_ms_word_shortcut_keys.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/071f80f8-cb87-4660-833f-fe48e7981588/plantronics_legend_5200_pairing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46426aa8-e96e-4185-8cd6-4c48f0bde1dc/mejores_cursos_de_ingles_online_certificados.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_off0000ec59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC59 5664 bytes
SHA-256: 72aaa6a4f01edc4f797fd63e53b0c1413686106b9147c36ca9664fde3dbe8c9f
font_01_sfnt_off0000ff97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 11360 bytes
SHA-256: 0cff187d3e690fe47eccb78b5fbea438f5e7f271bf1541ebcafdc6f1a93032a9