Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3909f0351ec9ca…

MALICIOUS

PDF

72.2 KB Created: 2021-03-18 05:20:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: a133e4e2c6709433b84b1bbc71f594b9 SHA-1: 932c482de6dbc94e43c5f6374b64ad1e2d48c3d9 SHA-256: af3909f0351ec9caaf08f2d4690fe950a18a25a1bbb05537705a9240d904157a
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of external URIs indicate a phishing or redirection attempt.

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://soxebez.ru/wix?keyword=animal+farm+study+guide+questions PDF link annotation
    • http://sotovezi.22web.org/bluestacks_apk_install_failed_no_matching_abis.pdfIn PDF document text
    • https://cdn.sqhk.co/fetuxudo/ifjjiaP/kingdom_business_association.pdfIn PDF document text
    • https://cdn.sqhk.co/nozelenid/CiagduJ/barbie_fairy_princess_dress_up_games.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/bibudag.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/common_sense_questions_in_urdu_with_answers.pdfIn PDF document text
    • http://xupevagadozojad.22web.org/55861903395.pdfIn PDF document text
    • http://poxinezov.iblogger.org/34015747780.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b83b32fe-8b0c-4ab7-a5c6-afe451284f61/what_is_the_titans_curse_about.pdfIn PDF document text
    • http://juxalabubifogis.rf.gd/womixajiludajegowijalig.pdfIn PDF document text
    • http://nufaviziziji.epizy.com/neniguwidibegato.pdfIn PDF document text
    • http://nafabumawo.rf.gd/webarchive_to_converter_for_windows.pdfIn PDF document text
    • http://xelewesepogov.rf.gd/95407407770.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f67b31c-56a8-4e5e-accf-965226018e98/how_to_tell_how_old_a_reliance_hot_water_heater_is.pdfIn PDF document text
    • http://rojaxenutu.rf.gd/hardest_logic_riddles_with_answers.pdfIn PDF document text
    • http://tesapul.epizy.com/kodetivodurivu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fad68ec-28c0-4079-a8d8-8b5748d1fcfc/dryer_doesnt_start_just_clicks.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_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 5444 bytes
SHA-256: b2b05275f388857ca4b5476dd3dfd2a3160d7aad3533ec82cf7691af79a7b8e5
font_01_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 10520 bytes
SHA-256: a0f3526c911d11177236f4dcbae23bf42fb2d144f0726097107798b0b5770a57

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