Malicious PDF — malware analysis report

Static analysis result for SHA-256 181c491f790573c5…

MALICIOUS

PDF

73.3 KB Created: 2021-02-27 17:25:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c6f7665802f8027b1ad361c0f530e0bc SHA-1: 273f0f06f1834e0a53128745f9a120b29ebfdcc5 SHA-256: 181c491f790573c5231f7b33ca0586aa52db05625cf7dcfcf55680464386cffa
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URLs, suggesting it functions as a link farm or a lure to phishing or malware download sites. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support its role in directing users to potentially harmful 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://maypoin.ru/award?keyword=how+to+read+lowrance+elite+4+hdi PDF link annotation
    • https://siridadujaxata.weebly.com/uploads/1/3/0/9/130969300/vetuzafo-wewokatoxinerox-nopasatirukup-moxalamok.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/hd0liju/soccer_superstars_2011_mod_apk.pdfIn PDF document text
    • https://jefiwoso.weebly.com/uploads/1/3/5/9/135996081/9523315.pdfIn PDF document text
    • http://jibifiva.22web.org/24608517776.pdfIn PDF document text
    • https://wamabiror.weebly.com/uploads/1/3/1/1/131163705/lagewapoxomutudus.pdfIn PDF document text
    • https://zafapuguma.weebly.com/uploads/1/3/2/7/132712217/cd74980af420cf.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/fexegotivaput.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/pTijrNo/cobi_hoops_2_lasers.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/28875589219.pdfIn PDF document text
    • http://desokore.medianewsonline.com/what_is_domestic_mail.pdfIn PDF document text
    • https://cdn.sqhk.co/jebumujo/92dVIFz/memorial_for_kobe_and_gigi.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/66321941327.pdfIn PDF document text
    • https://jajibesuwazigix.weebly.com/uploads/1/3/1/3/131383486/1ad8d0.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/11680273570.pdfIn PDF document text
    • https://lewubudakaxawo.weebly.com/uploads/1/3/4/3/134342842/natirazub.pdfIn PDF document text
    • https://jalaxogazumin.weebly.com/uploads/1/3/4/3/134373329/a8f23a4443.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zorarizasodefa.epizy.com/9132668214.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_off0000e4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A7 4992 bytes
SHA-256: 1196090f0130607bbe25ab2a2aa86d9a87fa886b41001af70fd9db09a353a577
font_01_sfnt_off0000f5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 10184 bytes
SHA-256: 9bcc737fab64c90ac9173d6a8995e2d2db7119151381df63b5bf5d5f07130aae

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