Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d9de683366367b…

MALICIOUS

PDF

88.1 KB Created: 2021-06-04 10:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ec5e7d2779977d55f475ee7f2b15ac2b SHA-1: f79462948c3ed749a997df35d787e80373509f52 SHA-256: 91d9de683366367bc08e5f076e7280b8ebb093a359b379c8f6cd9dcd1737c2d9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/pbw?utm_term=income+and+expense+worksheet+for+self+employed PDF link annotation
    • https://sukojafura.weebly.com/uploads/1/3/4/6/134632918/400575a41b0.pdfIn PDF document text
    • https://vaxinukosiju.weebly.com/uploads/1/3/4/6/134625250/gewobe.pdfIn PDF document text
    • https://lomofatawepap.weebly.com/uploads/1/3/4/5/134599642/mufon.pdfIn PDF document text
    • https://tigisara.weebly.com/uploads/1/3/4/6/134651617/7623465.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/fcb11a44-c1eb-4665-803d-399f06cce33c/kjv_life_application_study_bible_third_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/899436c4-a0ee-42bc-a721-3fe7d7cac086/maytag_neptune_dryer_service_manual.pdfIn PDF document text
    • http://zuwofig.pbworks.com/w/file/fetch/144534969/cubes_and_dice_-_non_verbal_reasoning_questions_and_answers.pdfIn PDF document text
    • http://supatibu.pbworks.com/f/justinas_marcinkeviius_mindaugas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18013dc9-15b9-470b-bb03-f1e829420c7b/66225867101.pdfIn PDF document text
    • http://xodelow.pbworks.com/w/file/fetch/144588774/transformation_geometry_slideshare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e182c48c-0c84-4dbe-8cd5-830b6170b1e6/discovering_our_past_a_history_of_the_world_early_ages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/568948cc-78bc-402d-90bf-bc343ca718a8/suzuki_sidekick_4x4_for_sale_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e157a5f2-4de5-4c75-a02f-eb1453355c81/98951948755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/035da773-5588-41a6-8303-345bc09a5898/zimepuvisufekiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab60908c-1b7a-4abf-821f-abd0a524b0d3/what_causes_a_car_to_get_stuck_in_gear.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b878803-d021-45f9-9667-c8af3a4d2ba4/what_are_hidden_photos_on_my_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6c7b68-8829-4495-8ac3-c3b58636891d/gajejisewukomadujuvug.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_off0001195e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195E 5660 bytes
SHA-256: a4a644a932c8d62ef0614869a973d6ce91843db664c3401edec93779045afae4
font_01_sfnt_off00012c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C95 11492 bytes
SHA-256: 6e29fff655c111b90a8140d5319efd8623f8747b158c3fe5dbedf7269bcec3d7

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