Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ef0182d1e1e191…

MALICIOUS

PDF

106.4 KB Created: 2021-02-26 05:39:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7c656ca0802add39e798b8f9ebc6cc5a SHA-1: aeb9825339526f461772dfd8166563153aa6a44f SHA-256: 42ef0182d1e1e19149d2ff9389ae9a3abcdb2f48801154687e04203836b424eb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wix?keyword=rii+mini+wireless+keyboard+with+touchpad+%2528rt-mwk01%2529+manual PDF link annotation
    • https://fanuterose.weebly.com/uploads/1/3/3/9/133999321/mejufudutinibirof.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/DgjigVy/resident_evil_movie_cast_netflix.pdfIn PDF document text
    • https://dirifulezidume.weebly.com/uploads/1/3/2/7/132740871/1331493.pdfIn PDF document text
    • https://bolukuja.weebly.com/uploads/1/3/0/7/130739437/rarolitokovi.pdfIn PDF document text
    • https://cdn.sqhk.co/towojutal/ibiejfM/taxuxa.pdfIn PDF document text
    • https://xavelimati.weebly.com/uploads/1/3/5/2/135298033/387209b8d.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/cG5ibTs/cara_cheat_score_hero_ios.pdfIn PDF document text
    • https://gumakamatiz.weebly.com/uploads/1/3/4/6/134600955/rekupegiji.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/eOja6ug/vonujun.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/xididezifijuvasamiw.pdfIn PDF document text
    • https://cdn.sqhk.co/texojijoraso/gfhbge5/curved_line_connecting_notes_of_same_pitch.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/funetowixujovas.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/jjHiege/tigazubanozajirawulonis.pdfIn PDF document text
    • http://vejefulolite.22web.org/sodunimoperejafekub.pdfIn PDF document text
    • https://dafujoxuw.weebly.com/uploads/1/3/0/9/130969001/jixujuki_miripuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jifazuniduvosi.epizy.com/the_crown_kiera_cass_free_download_english.pdfIn PDF document text
    • http://sufiwidixoga.epizy.com/bunirodogejita.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/24526550443.pdfIn PDF document text
    • http://fivamoxopel.epizy.com/64368812846.pdfIn PDF document text
    • http://sugebajofurite.rf.gd/24_hours_per_day_hazelden.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15587 2880 bytes
SHA-256: 619a44e8b5c2a2d3fc0e18259d8022938ad4f8b30552901bc68dc41c3d0f2ef0
font_01_sfnt_off00015fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FC5 6100 bytes
SHA-256: 82232e60d19acec2845d3b2cc40ddff6e1aab695d3569bba3cd36720b104cf6a
font_02_sfnt_off00017485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17485 11236 bytes
SHA-256: f276323564203ed135749e930fc68b0aa25c94fe955f381dde0d243d0020cc59