Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd936e61eb2fa518…

MALICIOUS

PDF

84.5 KB Created: 2021-02-20 14:49:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9abdc7d2c35360fb0382345fbb587849 SHA-1: eb1663a40c6485723347203965bd5ab5c49ba78c SHA-256: dd936e61eb2fa518f71b515e124b1b04dd13257dc2d516879f975e8a4b9874c9
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, characteristic of a link farm or SEO spam operation. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest an attempt to redirect users to potentially malicious websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=how+big+is+a+sonic+mini+shake PDF link annotation
    • http://youtube-subscribes.com/vidimiro3c7j1.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/jeGrjjv/google_assistant_voice_shortcuts.pdfIn PDF document text
    • http://custits.space/fonopuranetuwinio72dc.pdfIn PDF document text
    • https://cdn.sqhk.co/nigalasiline/v7hgHE7/2650_retro_arcade_machine_console_3d_games_mario.pdfIn PDF document text
    • https://dujomujur.weebly.com/uploads/1/3/4/8/134883281/6671881.pdfIn PDF document text
    • https://cdn.sqhk.co/sirojenu/geQQric/air_traffic_controller_salary_requirements.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/chfjfjh/update_software_on_ipad_1.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/AhcbNSm/toxiwamakivese.pdfIn PDF document text
    • http://hamsterbig.com/download_fonts_for_word_2016jofw6.pdfIn PDF document text
    • https://tirasuvemesamu.weebly.com/uploads/1/3/4/6/134672388/0b741e4eb5d3.pdfIn PDF document text
    • https://sisareses.weebly.com/uploads/1/3/1/4/131454440/kofitowodumura_sofop_rasasesevalafev_safupasutituti.pdfIn PDF document text
    • http://itawegan.space/303319578056szy2.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/1023b.pdfIn PDF document text
    • https://nuguviroguzemek.weebly.com/uploads/1/3/1/0/131070089/83a921.pdfIn PDF document text
    • https://gidaletibom.weebly.com/uploads/1/3/4/8/134881461/876f5e89e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xajowu/is_the_tree_of_life_bible_accurate.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/35615377120.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/2369680791.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A9 5172 bytes
SHA-256: 2e65757ca6d29bf408483e46085dba7702cb3382f623de4574a69c0798fa8110
font_01_sfnt_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 5340 bytes
SHA-256: cb67c8a4d8f09af4f5410834c6493a4a8b4dae647fb7f18a3b79a4b9dee964bc
font_02_sfnt_off00010596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10596 12152 bytes
SHA-256: 598dd21b285d372f417640e9fd76df2dc9113e31734989676484eb1a3e7e9598
font_03_sfnt_off00012d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3A 16076 bytes
SHA-256: d4a88a3a8205faafa880075823aabd831252e3f8020b7d06daf30e92536d8b86