Malicious PDF — malware analysis report

Static analysis result for SHA-256 803a89469b31ee11…

MALICIOUS

PDF

86.0 KB Created: 2021-06-08 18:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 03d8a3ea45875346a5ff2abc4850cda6 SHA-1: 0a801547954c09513df14bd486aaa05860f4e277 SHA-256: 803a89469b31ee11a7bc31a421507dfe4639a1c574237a6b0a8469ccf4c54fe0
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute various files. The presence of a URL with a 'download pirate of the caribbean mp3' UTM term indicates a lure for potentially unwanted or malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://krisoc.ru/pbw?utm_term=download+pirate+of+the+caribbean+mp3 PDF link annotation
    • https://fibadajemuda.weebly.com/uploads/1/3/2/3/132303382/xopot-lijoneturufigil-zunimisejek-nenunogebuda.pdfIn PDF document text
    • https://kolivobaka.weebly.com/uploads/1/3/4/5/134500933/wosekupej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454048/normal_6009bc7b67919.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4447465/normal_60b18d69bd04d.pdfIn PDF document text
    • https://fujinimozebuxe.weebly.com/uploads/1/3/0/7/130738673/dowolajepiruwuwoto.pdfIn PDF document text
    • https://tumulole.weebly.com/uploads/1/3/6/0/136054957/4637621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463794/normal_60402eed8229b.pdfIn PDF document text
    • https://nepubodi.weebly.com/uploads/1/3/4/6/134610278/9da52eb96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zupelapowi.pbworks.com/f/ghost_recon_predator_apk_obb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a24e93-d091-4ab7-a378-4fe598cbc341/agatha_christie_books_hercule_poirot_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f960c2-87d5-4b44-b972-59e2cccbd29e/cuantos_centimetros_tiene_un_medio_metro.pdfIn PDF document text
    • http://fokojifidesi.pbworks.com/w/file/fetch/144864081/wupesirodex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af78c04e-2de0-4936-aa43-a73abe7b45dc/why_does_gardner_use_zodiac_signs_in_grendel.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/ledotijirulisefalawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be815164-8bf3-490f-a99f-a3c58b3dfe26/lurirefogekulewuzoruvoj.pdfIn PDF document text
    • http://vikowezanipe.pbworks.com/w/file/fetch/144587340/how_to_top_up_contactless_cashcard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbb9a993-9fbb-469c-a027-345322b9685e/honda_generator_em5000sx_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75df90af-c692-4350-84c1-91d7f23e17d2/expressions_of_agreement_and_disagreement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4605939e-0a95-4dd1-a2ce-937671651dda/80798222268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12940960-b894-4aca-b811-d9d38f1823f2/wired_for_love_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce8fa962-a487-4232-88b7-efe81ab6ee47/do_deep_freezers_have_a_reset_button.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 3724 bytes
SHA-256: bbb873dd98aff897d8dfc5c59157c32692230a5639bb8b40ee3dff357fcdddb7
font_01_sfnt_off0000fa0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 5400 bytes
SHA-256: be2d3885c86a1dd73a5bb8539a0b796f98e2ba2dfdd2a9a44bb720bcb2433419
font_02_sfnt_off00010c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C46 15092 bytes
SHA-256: ea8896b13f00e3c4c252a77af70694eba4b8828a9973bcd54f4ba856f6b834f8
font_03_sfnt_off000139a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A3 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c