Malicious PDF — malware analysis report

Static analysis result for SHA-256 979bd0adc34f7dc3…

MALICIOUS

PDF

73.8 KB Created: 2021-03-26 07:32:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5cae100cdcd873e8582ee56cb9ef8ea SHA-1: dc6a60ff52df6367d01246eee577cbdeac221236 SHA-256: 979bd0adc34f7dc3f7373f2ecff6ceb17564636d9dd0d2e7077613c8086a2d42
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one particularly suspicious URL pointing to a domain associated with phishing and malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious purpose, as the PDF acts as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=x+core+hunter+sensor+bypass
    • https://cdn.sqhk.co/wabitakenina/SifieAy/planet_of_the_humans_debunked.pdf
    • https://pumewigegokofav.weebly.com/uploads/1/3/4/3/134317234/xonokikosebat.pdf
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/rigojirofixejuti.pdf
    • https://cdn.sqhk.co/pigujoxexate/oyG0tge/free_offline_domino_games.pdf
    • https://riviruzo.weebly.com/uploads/1/3/0/7/130739493/7e24a4397796.pdf
    • https://cdn-cms.f-static.net/uploads/4368266/normal_602502e1215e6.pdf
    • https://cdn.sqhk.co/kafekogi/Nje5yaZ/ap_us_history_chapter_7_study_guide.pdf
    • https://cdn-cms.f-static.net/uploads/4414164/normal_601ca1da24200.pdf
    • https://cdn-cms.f-static.net/uploads/4447433/normal_605411665ce93.pdf
    • https://cdn.sqhk.co/gixenako/fhfC0ie/lily_story_dress_up_game_online.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/26616ddc-7125-4e87-84b2-463f43d02c29/hp_laserjet_3055_user_manual.pdf
    • https://s3.amazonaws.com/kozibowisenatu/beige_high_platform_shoes.pdf
    • http://fawixixajij.rf.gd/15263314758.pdf
    • https://s3.amazonaws.com/gajakelegeza/investopedia_fed_balance_sheet.pdf
    • https://s3.amazonaws.com/dojivewobasuval/calculating_the_area_of_compound_shapes_worksheet.pdf
    • http://luwemazezabubat.rf.gd/hill_manufacturing_msds_sheets.pdf
    • https://uploads.strikinglycdn.com/files/53431d66-4131-421b-a3a0-af30429e2a89/excellent_definition_and_examples.pdf
    • https://uploads.strikinglycdn.com/files/8cf3adda-d4f0-45cc-b2dd-a70418d59f98/what_does_family_dollar_pay.pdf
    • https://uploads.strikinglycdn.com/files/35498d6f-b25f-4304-9654-a18de66c9c03/arduino_nano_every_pin_names.pdf
    • https://uploads.strikinglycdn.com/files/3a7b38f6-5a32-492b-bb8b-6491b2556513/the_school_for_good_and_evil_personality_quiz.pdf
    • https://s3.amazonaws.com/wujapu/the_social_learning_theory_of_aggression_worksheet_answers.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e440.bin
5da1ec71589c243d058058053d2afb51ef5ce1f1293fdab9f4bc641ec9bebd60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 5208 bytes
font_01_sfnt_off0000f5f1.bin
68ca35cd6aa38d8adc814acbdb3bc900100d4483c9f2b3d793318bd08b7dc193		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 10408 bytes

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