Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93a274ac2024a7a…

MALICIOUS

PDF

74.9 KB Created: 2021-06-09 01:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7ce4c9ae1ee2fb50021a532dae364eb6 SHA-1: 337980d6e8252498bd9741483d781e0c411c49c9 SHA-256: e93a274ac2024a7a7c4af7fe9adb99a39af2f52014fdfac6a3816452abc32652
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains references to a 'converter app' and metadata from wkhtmltopdf, aligning with the heuristic findings of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://archism.ru/pbw?utm_term=change+passive+voice+to+active+voice+converter+app PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495843/normal_60648f4950322.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420432/normal_6008363f8b82f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408009/normal_5ff69c4c095e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386086/normal_6041bca35f7a9.pdfIn PDF document text
    • https://rilebowiteb.weebly.com/uploads/1/3/3/9/133986594/6766928.pdfIn PDF document text
    • https://sivowudu.weebly.com/uploads/1/3/7/5/137513174/7570d.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/sutewagilasasom_dabujabot_gidunozisif.pdfIn PDF document text
    • https://kumobavubisu.weebly.com/uploads/1/3/0/7/130775432/panireniv.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/281f062c-d67c-4e30-aa61-cc2365c8af08/risir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/943dd498-cd4c-4433-beb0-30fbd4df8a1b/tixotatopiwazelazapaluzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3298b0f8-297a-4cbc-a86f-9d60ab3a4c24/comet_30_torque_converter_adjustment.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/rijisixowojatenorejime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/336fad08-4ed3-4915-8420-001f0106276b/exercice_dentrainement_gardien_de_but.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/977a042c-92e8-4452-960c-20ecce046e40/sokebin.pdfIn PDF document text
    • http://gijorugisaw.pbworks.com/f/baojie_bj-318_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f230129e-5639-40ce-9a8f-91295f61301b/fifty_shades_of_grey_movie_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea2585f8-fa0c-4f3e-b595-0995794205b1/98479341823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ebaf6ec-a200-4833-9856-e97e6bbf65a5/can_am_xmr_1000_side_by_side.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c938cd3-eb1e-4dcc-aa59-2558e32d8d34/laxokaluliwopuzitifijodon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ae1b591-776f-4ac6-b1e4-0fe7e4eeabbb/pizuvumotojatapevibedevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c010143-07e6-4e3b-9eec-631b82da825d/french_alphabet_pronunciation_chart.pdfIn PDF document text
    • http://jopamedet.pbworks.com/w/file/fetch/144452235/cbse_syllabus_change_2020-21_class_10.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_off0000e332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 5128 bytes
SHA-256: 061b08b16d45d75f9fe8d5533a62769cc6ed73cc29ac7737b2d1ab6d0550a264
font_01_sfnt_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 12296 bytes
SHA-256: 68e4751773a09c2effa29dad155609cb01ae133b9732b3dcc2d33ccb12c248f1