Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af8dd98192fb3f4…

MALICIOUS

PDF

82.5 KB Created: 2021-03-01 13:53:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 71e2d1e6abf0d05c11a52a0d3fb6405f SHA-1: a1d9ff1dcc6e992c63c79c2c1004bdc517ab156a SHA-256: 5af8dd98192fb3f40dacb0e5d0c3d551dafbaae7b35d4f5fb0ac1df01b34c338
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, including 'ponafet.ru' and 'gafeziluwer.weebly.com'. While no scripts were explicitly extracted, the PDF structure and its nature as a link farm suggest it is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=casio+gw+9400+rangeman+price PDF link annotation
    • https://gafeziluwer.weebly.com/uploads/1/3/4/3/134310472/9a7d3248b685.pdfIn PDF document text
    • http://nofowopomi.iblogger.org/kreepy_krauly_kruiser_in_ground_suction_side_pool_cleaner.pdfIn PDF document text
    • https://cdn.sqhk.co/bizifabov/gdbe5ih/weed_inc_idle_tycoon_hack_ios.pdfIn PDF document text
    • http://rowozogano.22web.org/53150304094.pdfIn PDF document text
    • http://ruzoboxilotazex.22web.org/what_inferential_statistics_do.pdfIn PDF document text
    • http://zelolugo.22web.org/lego_harry_potter_ps4_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/mimufedu/JfihieB/littlest_pet_shop_toys_for_sale_cheap.pdfIn PDF document text
    • http://rukunikuxajosog.22web.org/51888346928.pdfIn PDF document text
    • http://wapavekegiwuxaw.iblogger.org/anemia_falciforme_causas_sintomas_y_tratamiento.pdfIn PDF document text
    • http://bisipatelaloguj.66ghz.com/51210314330.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://japuxizikaroviv.rf.gd/calculator_apps_hider.pdfIn PDF document text
    • http://navenogu.rf.gd/the_exorcist_book_characters.pdfIn PDF document text
    • http://serivisaruwe.epizy.com/taman_nasional_alas_purwo.pdfIn PDF document text
    • http://kutiliv.epizy.com/what_is_td_thinkorswim.pdfIn PDF document text
    • http://pewulalabes.epizy.com/bluestacks_software_free_for_pc_softonic.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 6548 bytes
SHA-256: a16d78b4e765d5ee2bbe34147faa0d9708ca9f4bd36cf3b090d8d65c0d41a973
font_01_sfnt_off000104a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A3 5604 bytes
SHA-256: 2c0887ee1d8c8dcc005ebf0c7aa31991751b50d4781dda8c16983d871797a2a3
font_02_sfnt_off000117b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B0 10916 bytes
SHA-256: ec0f473f2df7fa0ac97f251896b5baa409e60bda69385fef6d46654bcc1d9815

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