Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e1e85b548ee1a5…

MALICIOUS

PDF

76.5 KB Created: 2021-03-30 14:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fa0ef022981709a7a7a990003c7d479c SHA-1: a3f04e6012d2a81102929e8010c851388a47558a SHA-256: 56e1e85b548ee1a5827bee9bb5188871105ab4915bb9cb9ec556de6638172bd5
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. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, contains a plausible lure related to keyboard issues, intended to drive users to click on the malicious links.

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://xajibur.ru/strik?utm_term=my+keyboard+shift+key+is+not+working+windows+10 PDF link annotation
    • http://wirelessinfo.ru/siwibijupebafopadaviguminf15.pdfIn PDF document text
    • http://true-board1.club/tuxofidiximitinrizo.pdfIn PDF document text
    • https://cdn.sqhk.co/wotirixa/8RjjhiS/grand_theft_auto_3_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/rubalibuzodi/vOb5he5/15250994164.pdfIn PDF document text
    • http://business-open.online/what_are_the_14_effective_conflict_resolution_techniquesuqlzw.pdfIn PDF document text
    • https://cdn.sqhk.co/vefomatakin/gcXQbgf/verezigudolaxo.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/nuzulimakubunek.pdfIn PDF document text
    • https://rupasofo.weebly.com/uploads/1/3/4/8/134892789/de1dca383d33.pdfIn PDF document text
    • http://fezelegafefuv.mywebcommunity.org/dozukose.pdfIn PDF document text
    • https://ludolukek.weebly.com/uploads/1/3/4/6/134699908/2075736.pdfIn PDF document text
    • https://cdn.sqhk.co/paxepedamaxa/ahfjahd/4753357823.pdfIn PDF document text
    • http://werikipirojenob.scienceontheweb.net/foxokadoripuwagutubov.pdfIn PDF document text
    • http://ru-dev.xyz/58572732264zre5t.pdfIn PDF document text
    • http://latuha.com/dexirasijuwadolepuvbpq57.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/banking_terms_bankers_adda.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/dorulusof/liwiju.pdfIn PDF document text
    • http://pozijawikubinun.myartsonline.com/satoj.pdfIn PDF document text
    • http://gegukisakewomo.rf.gd/sojavafumaxakukibagi.pdfIn PDF document text
    • http://kimogule.epizy.com/honda_lawn_mower_service_dealers.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/1048511791.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 5732 bytes
SHA-256: a831c608fdc296dde0ec3cfea47c429e457235210a28d665ea45d481ce16a67a
font_01_sfnt_off00010005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10005 10780 bytes
SHA-256: 99b9fbb5b7de597a7c6343de57a73b6837cccb1924794831af385e7315d17fb4

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