Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb3373088403f0e…

MALICIOUS

PDF

75.5 KB Created: 2021-06-10 07:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: de2525972bf09216571c2e284136c193 SHA-1: cb1d0ff3db14e5ca30e182025dec98d2622ca691 SHA-256: 6fb3373088403f0e89649550a63e673f00d95d057b2a2f2db51ec4c1b2545a0b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, and a high-confidence ML classifier and ClamAV detection indicate maliciousness. The document body, though heavily obfuscated, contains text related to an 'English grammar checker online', suggesting a lure. The presence of external URIs and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://drafthe.ru/pbw?utm_term=english+grammar+checker+online PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4451220/normal_60b1d7379362c.pdfIn PDF document text
    • https://zizudenavoxe.weebly.com/uploads/1/3/4/0/134017195/podovawuv.pdfIn PDF document text
    • https://vabusise.weebly.com/uploads/1/3/4/3/134385335/5e410897581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447447/normal_60b92ab006606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471484/normal_604862c08a373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422147/normal_6044dfbca15e4.pdfIn PDF document text
    • https://pofisuxix.weebly.com/uploads/1/3/4/0/134016862/3724893.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458633/normal_5ffde087efbf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_6068b676ed6bc.pdfIn PDF document text
    • https://fonagavo.weebly.com/uploads/1/3/4/3/134315946/jifurufi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393363/normal_60699987ab78d.pdfIn PDF document text
    • https://kakewexetoza.weebly.com/uploads/1/3/4/6/134693891/mikelopokomowop.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/0c3e18de-56ae-4264-8a66-b3fc97149a45/raginino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6aa9991-3403-4d69-926d-902375ac352d/how_to_install_a_new_outdoor_motion_sensor_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04703d29-9409-4476-8ba2-a1ce3c156a4e/how_to_use_the_breville_smart_oven_air_fryer.pdfIn PDF document text
    • http://faxofapuf.pbworks.com/w/file/fetch/145022088/69126687570.pdfIn PDF document text
    • http://pifiloxema.pbworks.com/w/file/fetch/144734748/dagezazamulewofuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f402ed-4fe4-48d5-b2f7-c60925f68a52/types_of_interior_walls.pdfIn PDF document text
    • http://fipivuzigoge.pbworks.com/w/file/fetch/144424488/velaxanoponosuwubev.pdfIn PDF document text
    • http://litorabi.pbworks.com/f/how_to_drive_a_manual_car_for_beginners_in_south_africa.pdfIn PDF document text
    • http://tulusozofel.pbworks.com/f/23049553829.pdfIn PDF document text
    • http://nixefijevumu.pbworks.com/w/file/fetch/144938187/41452083803.pdfIn PDF document text
    • http://gazoridixilu.pbworks.com/f/battle_realms_2_pc_download.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_off0000e96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96B 5232 bytes
SHA-256: 2f19cd59d028883caafbd8ee30f3156d57fbae843310156e483642f685635150
font_01_sfnt_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 11008 bytes
SHA-256: 56b41a25331fd5ca12542789807f65ff38ecf37c5340fee053f5f0231ada93d1

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