Malicious PDF — malware analysis report

Static analysis result for SHA-256 266f8adfe131d373…

MALICIOUS

PDF

75.9 KB Created: 2021-06-10 12:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 805e753f202fcc45ed4cccadcc7fe434 SHA-1: 75a9ea71ee991532c8646d937fd1686e496b536b SHA-256: 266f8adfe131d37334092649a6917651db7cc45abf23a4df9b5097669cd1c0a7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. One of the primary external URIs points to 'inwebjor.ru', which is likely part of a malicious campaign. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/pbw?utm_term=neo+soul+jazz+chords
    • https://diwosilanula.weebly.com/uploads/1/3/4/7/134765308/8429690.pdf
    • https://cdn-cms.f-static.net/uploads/4423189/normal_606645ac8c18d.pdf
    • https://gujaninarenuwin.weebly.com/uploads/1/3/4/3/134319279/tajiji.pdf
    • https://fekakawe.weebly.com/uploads/1/3/1/4/131437222/113658.pdf
    • https://cdn-cms.f-static.net/uploads/4491436/normal_60244686e69d4.pdf
    • https://wazafalesozem.weebly.com/uploads/1/3/4/4/134498636/luxujuvijuwipebe.pdf
    • https://cdn-cms.f-static.net/uploads/4450864/normal_605a3f3964da1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://kimotamiju.pbworks.com/f/math_minutes_7th_grade_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/eb1bddda-fa5d-47b7-af3c-59b2cec4077e/rolukakozetevazik.pdf
    • http://zuwuzemoj.pbworks.com/f/realidades_3_capitulo_3_guided_practice_activities_sheet_7_answers.pdf
    • https://uploads.strikinglycdn.com/files/6a2a09ad-aecb-4bd1-a559-04f762eed821/what_is_special_customary_international_law.pdf
    • http://tebejeloxid.pbworks.com/f/weber_cutting_machine.pdf
    • https://uploads.strikinglycdn.com/files/cac2c404-f556-4f77-8253-928e962fff12/82016408695.pdf
    • http://vibuvedatixi.pbworks.com/w/file/fetch/144732477/integration_and_differentiation_of_trigonometric_functions.pdf
    • https://uploads.strikinglycdn.com/files/eeff3369-2bc1-460f-b11e-a75754577dc0/76504655732.pdf
    • https://uploads.strikinglycdn.com/files/d20998c5-0532-4c46-9466-9b3b8cd883fe/beretta_a300_outlander_semi-auto_shotgun_with_black_synthetic_stock_reviews.pdf
    • http://zuvuzut.pbworks.com/f/e_kitap_oku_indir.pdf
    • http://kejufavo.pbworks.com/f/download_fifty_shades_darker_movie_2017.pdf
    • http://kiletejude.pbworks.com/f/2017_ap_calculus_ab_free_response_question_1.pdf
    • http://vixifalino.pbworks.com/w/file/fetch/144657855/86801310378.pdf
    • https://uploads.strikinglycdn.com/files/55f2af00-1477-48fa-9d34-8cd990999e6c/printable_fortune_cookie_sayings.pdf
    • https://uploads.strikinglycdn.com/files/dc48ee1d-956c-4d11-8352-e50ffeea9830/stock_symbols_list_canada.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deb2.bin
06c375a981ba9402c6260823d16575d23bb2972c9a455e682ccf34ef449831f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB2 4768 bytes
font_01_sfnt_off0000eefd.bin
79636b1d1465862c19bd0cfc322001fe13a77c58030b71ed3975bc6df67b3140		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 10724 bytes
font_02_sfnt_off000113b4.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113B4 4324 bytes

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