Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc2e8ad2d7135fb…

MALICIOUS

PDF

78.2 KB Created: 2021-02-19 16:01:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 947a46120d081a6808049984177058ac SHA-1: 20f309c1756f3b83f1570f0a619dd734bee73d8b SHA-256: fdc2e8ad2d7135fb360d9ea1afe73267cea2333419649725375fa0e6d6c4e6d8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious tactic. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or malware distribution vector.

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://seumenha.ru/strik?utm_term=heat+exchanger+for+flue+pipe PDF link annotation
    • http://tozevikuju.66ghz.com/irregularly_spelled_words_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/sativomofij/hdXggJf/16243945501.pdfIn PDF document text
    • https://fuzipoxo.weebly.com/uploads/1/3/0/8/130873840/kaxejepefilom.pdfIn PDF document text
    • https://cdn.sqhk.co/bavisimupux/ihjZA84/11123156482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472788/normal_5fe971aec0a0b.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/jioiyOe/tokoxijirodedawov.pdfIn PDF document text
    • http://lusivemewuza.22web.org/rare_genetic_diseases_uk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lezufixigise.rf.gd/77988417401.pdfIn PDF document text
    • http://zojomesadenatid.rf.gd/bosonufifikinijubade.pdfIn PDF document text
    • http://fivadez.rf.gd/history_of_the_blue_book_army.pdfIn PDF document text
    • http://zepedijuva.epizy.com/admanager_plus_service_pack.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_off0000f7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 5128 bytes
SHA-256: 29ad65e7a653120969ae9d406ba9831a85530f9afc4b3b370165022271cec224
font_01_sfnt_off00010917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10917 10244 bytes
SHA-256: 93a03014d7dda0be7e90470bf30677a666f2df884c65f81d40756ab351cfa46c

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