Malicious PDF — malware analysis report

Static analysis result for SHA-256 676ebf31d706b602…

MALICIOUS

PDF

89.0 KB Created: 2021-03-28 18:40:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b8363b6d2e622fb4c1cfa00b03534179 SHA-1: 570b03015ba02494abe6026c32cb10e31143cdd1 SHA-256: 676ebf31d706b602fc9f73dbd612090be72413fcde1e345b4492e2de6515be6f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting or suspicious domains, indicating a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://nipisod.ru/wix?keyword=8th+grade+math+eog+review+packet PDF link annotation
    • http://mscredit.info/vosaseremov5m4f.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/hnjehco/frosty_boy_ice_cream_menu.pdfIn PDF document text
    • http://mx50off.pro/imperial_handbook_star_wars5zi9z.pdfIn PDF document text
    • https://cdn.sqhk.co/supetuzitepi/XlQzqjd/reelin_in_the_years_guitar.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/cCkgfeZ/78667630162.pdfIn PDF document text
    • http://nesobaka7.xyz/boxatolunajulaouk8d.pdfIn PDF document text
    • http://nextauto02.ru/616788453098utln.pdfIn PDF document text
    • https://cdn.sqhk.co/sebidurubuze/kTggeqi/nelson_mathematics_textbook_answers_grade_6.pdfIn PDF document text
    • http://construt.site/cecillia_wang_novel6xljp.pdfIn PDF document text
    • http://teaitalis.space/xafoduzizakusogobosojerhuxqh.pdfIn PDF document text
    • http://ru-1.casa/petsafe_in_ground_fence_systemqrecy.pdfIn PDF document text
    • http://lakshmi-store.ru/aristotle_and_dante_discover_the_secrets_of_the_universe_google_drive91q9v.pdfIn PDF document text
    • https://cdn.sqhk.co/soxosovave/cifDjab/retro_11_snakeskin_blue.pdfIn PDF document text
    • http://flash-sar.online/72890075389btl9m.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/3f77a9c6-6031-41de-98ca-ba38a512766a/line_6_spider_v_20_review.pdfIn PDF document text
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_881ddecec46849eeb408ed033188e755.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b37f88-19e8-421f-84ef-5fa586b36da1/dungeons_and_dragons_basic_rules_set_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4892d412-acfd-4ec4-bf33-480a66a16c76/84860011256.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4116aef5-53c9-4fbe-9436-fc35f7aea588/98445456731.pdfIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_501e33678fb042f2b20bdcab05d0ba4a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f21297c-ddee-4cb9-bf5a-342ac652a4bc/leadership_and_self_deception_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fe77c54-b338-433c-98ba-9418f46cc873/nursing_theorists_and_their_work_6th_edition.pdfIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_6d3ee313682a43cb9af4b30034ae8904.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b984437-192d-4071-91df-70c168e8b951/why_dna_contains_thymine_and_not_uracil.pdfIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_9d7e7af63a6c46fabbe31136cacdf76c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b2466a3-5148-41db-9d2b-6c4bd6f66ea3/bbg_zero_equipment_1.0.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_off0001195d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195D 5592 bytes
SHA-256: 32ce1fd6c1052218e02d50c844fd25a6d63e025c584e83a1e5f8829913403ece
font_01_sfnt_off00012c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C49 11888 bytes
SHA-256: a1ff199946d9caea21e2471a04ead22635a14a4f6aebf4f100064839a88828d1