Malicious PDF — malware analysis report

Static analysis result for SHA-256 a396a719787d8635…

MALICIOUS

PDF

74.6 KB Created: 2021-02-28 23:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 4833b834c5d515b46ac17c325c62d4ee SHA-1: c32fce2553ab7e8d0c1fef24e80afeeabdb5074a SHA-256: a396a719787d8635e9b215834ad9ae69f1ea0350efd22d7c83b1145f4d34ac85
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document is designed to host many links on disposable hosting, often a tactic for distributing malware or conducting phishing campaigns. No scripts were extracted, but the presence of numerous external URIs strongly suggests the document's purpose is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=merchant+of+venice+pdf+icse PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408584/normal_6004892fb0c31.pdfIn PDF document text
    • http://legugoboxebepe.22web.org/east_west_play_free.pdfIn PDF document text
    • http://xupevagadozojad.22web.org/avoidant_personality_disorder_book.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/samsung_range_display_problems.pdfIn PDF document text
    • http://sakipewo.22web.org/xuronowasizulonikanuwu.pdfIn PDF document text
    • http://luziniwanemek.sportsontheweb.net/miladys_standard_cosmetology_theory_practical_workbook_answer_key.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478131/normal_5ff13d416799c.pdfIn PDF document text
    • http://kudopifupelixi.22web.org/6895789247.pdfIn PDF document text
    • http://terugate.mypressonline.com/14617736122.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/reset_netgear_3700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427085/normal_602e4f23da474.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nizowozutagele.atwebpages.com/tedepas.pdfIn PDF document text
    • http://vavipok.epizy.com/zetoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/free_english_comprehension_worksheets_for_year_3.pdfIn PDF document text
    • http://nipofoxi.epizy.com/crossing_over_and_chiasma_formation.pdfIn PDF document text
    • http://pamiwumewamem.epizy.com/thinking_out_loud_video_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/17473156781.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/gogalikunasejiminon.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/antichamber_mcpe_map.pdfIn PDF document text
    • http://lofapubuwuleto.epizy.com/vamudanedusal.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE625 5276 bytes
SHA-256: 7119e857dbc29985ce40bf66a06921cdd82c600182e636b320c658b25d9aa52e
font_01_sfnt_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 10812 bytes
SHA-256: 569904c63477698f98107ef2aad6cb8abc9a26457eb056b0b2572b277464271e

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