Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc15732ae73401a…

MALICIOUS

PDF

80.1 KB Created: 2021-04-07 01:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 655386446bb28feee11945008934ce0d SHA-1: 254464558dbc364f6aed30cda40f8feb0615d6be SHA-256: 1dc15732ae73401abd45cb5e5f7f8344def36d508aa9e250a79585eedf17dc9a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a 'link farm', and one specific URL is highlighted as a potential lure. ClamAV and ML classifiers strongly indicate maliciousness, specifically identifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/123?utm_term=project+management+summary+template+excel
    • http://blog-millionaire.buzz/behind_enemy_lines_2_movie_download_in_hindi_480p903gp.pdf
    • https://mivagadak.weebly.com/uploads/1/3/4/5/134599435/d4ee32ce8eb24a4.pdf
    • http://autobuff.xyz/twitter_free_for_windows_10aftnx.pdf
    • http://zevixoleg.iblogger.org/rekikiw.pdf
    • http://yellownatural.space/how_to_reverse_data_order_in_excel_graphn1jp6.pdf
    • https://wikoxunorature.weebly.com/uploads/1/3/5/9/135968981/tugedapaxogo_jinosuzabago_zuwibabo_kedax.pdf
    • http://clyb-wylcan3.space/musicals_movies_1950sa2u96.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/64fedfdb-bb7f-41f0-8b32-b1d5a02e127a/30505561454.pdf
    • https://uploads.strikinglycdn.com/files/efdd4fda-e862-41e4-b669-e882a044c8d4/terogabepagev.pdf
    • https://uploads.strikinglycdn.com/files/48776ffc-a7e0-4954-a12f-d15f76c62fb3/va_citrix_access_gateway_login.pdf
    • https://uploads.strikinglycdn.com/files/b0b33cce-14bf-4eb5-bc6e-8f59ea0d36a1/nodesaloluvabe.pdf
    • https://s3.amazonaws.com/lomiwexuva/winobotalug.pdf
    • https://uploads.strikinglycdn.com/files/1567350a-a035-4f2c-a476-baa40952bc70/dilaguwoxalafigokazizaja.pdf
    • https://s3.amazonaws.com/jozaponi/cervical_screening_guidelines_2019.pdf
    • http://datonojafasaxup.rf.gd/ielts_reading_strategies_rachel_mitchell_free_download.pdf
    • http://dodarululi.epizy.com/building_vocabulary_the_progressive_era_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_off0000fc67.bin
f5452d47fcda7216e1b715efac3c6a0de4b94267e158b2816d455da3cee3083e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC67 5500 bytes
font_01_sfnt_off00010f18.bin
e8be5d8f1f4b7def592d4fd2bbea35ae06937b16eeba659c2532485ac1ec93fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F18 10680 bytes

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