Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ddc44fc5477e9d6…

MALICIOUS

PDF

77.3 KB Created: 2021-06-12 07:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ac4e26c250f299245af9173cc5955347 SHA-1: e66ac2c183c751df7bf43fa3d75cfe700d1725e6 SHA-256: 9ddc44fc5477e9d66b66315e269bb8d7c903c3b7cc1410c178c7a704e8aa393e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://smidgel.ru/pbw?utm_term=very+fit+pro+calorie+counter PDF link annotation
    • https://vogexuweju.weebly.com/uploads/1/3/0/9/130969932/3713091.pdfIn PDF document text
    • https://wevuretadoza.weebly.com/uploads/1/3/5/3/135320639/nemivazufu-tinukiponakabif-leluraribipigit-wusatajoziwebo.pdfIn PDF document text
    • https://tazorigebug.weebly.com/uploads/1/3/4/7/134766075/wivuzaradojasolaw.pdfIn PDF document text
    • https://lidalukedewad.weebly.com/uploads/1/3/4/6/134664428/798328.pdfIn PDF document text
    • https://woxevodojagub.weebly.com/uploads/1/3/4/6/134623787/dexadugapijadoja.pdfIn PDF document text
    • https://sowobufujugazid.weebly.com/uploads/1/3/0/8/130873997/fanesi.pdfIn PDF document text
    • https://katubebadidi.weebly.com/uploads/1/3/4/4/134474785/gutevoromiramu_midawezifak.pdfIn PDF document text
    • https://fiwugoxatalaj.weebly.com/uploads/1/3/4/4/134498599/927444.pdfIn PDF document text
    • https://didizotaxudip.weebly.com/uploads/1/3/4/6/134619455/kajamebuwibate-bigejavudoguge.pdfIn PDF document text
    • http://ns.adobeIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sawebaz.pbworks.com/f/teaching_prepositional_phrases_5th_grade.pdfIn PDF document text
    • http://rotulenixal.pbworks.com/f/ghd_sports_tv_latest_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65f09832-f92b-479f-84ff-e4ae8f8ac8bf/recorder_karate_belt_colors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21deb8d2-0cd9-4eec-a625-4df6ec308ab1/vawatefiwef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/539cd49b-8c12-41d8-98d7-0ae914036691/3633780793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ebf58e7-0d8b-4bac-9cb3-b7bb3b01cbb0/uppababy_mesa_install_fabric.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a002b93f-a539-4e5b-b67b-cabc81456e06/17680434623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21fe2f76-f37e-4e93-a89a-213cb158812e/84278067991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf2f4dea-c608-4514-bd9c-bbb245eb17ff/lets_build_a_cladogram_worksheet_answers_key.pdfIn PDF document text
    • http://vobaranizume.pbworks.com/f/10992745879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/342f05db-ea1c-4a61-ac41-421824398814/viwulejomakina.pdfIn PDF document text
    • http://namebitepu.pbworks.com/w/file/fetch/145046685/logo_quiz_b.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 9784 bytes
SHA-256: 644e135996a6dc01fac2ff5b41912ab2a8fe6f3f7356f4af66274631d7bf6c53
font_01_sfnt_off0000f78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 4896 bytes
SHA-256: 2ce14b6f082e7dccdd79db820d4a67726abafa345b73c0775a01c1e507b5537f
font_02_sfnt_off00010858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 9956 bytes
SHA-256: e88ae42d489f08d15ad74aa20b8512bab4609c0a9394af484e8373773cbd9192