Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0395c289900e312…

MALICIOUS

PDF

76.2 KB Created: 2021-02-25 12:42:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 39088b50e07cdc19f28c411803f600e8 SHA-1: 15b79e4280eb07a8793a19b293638722eae40089 SHA-256: f0395c289900e3123690f0e9f466ba2437c0982b010d841a2b39d1d301c0adb2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing. The primary URL, https://maypoin.ru/strik, is likely a malicious redirect or landing page. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=how+to+recharge+car+battery+without+charger PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421943/normal_5fd09d91762c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478132/normal_5ff9ee043ece3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403672/normal_60367759c510a.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/7TdXShi/background_color_not_printing_in_word_2016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445115/normal_601fee81e62c9.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/zifex_fimerelujeni_nudaxasakezini_dugokubebi.pdfIn PDF document text
    • https://kowojifab.weebly.com/uploads/1/3/4/6/134622532/1850921.pdfIn PDF document text
    • https://repemokalit.weebly.com/uploads/1/3/1/8/131856723/lamelom.pdfIn PDF document text
    • https://gojamomajaso.weebly.com/uploads/1/3/4/6/134616238/pavusow.pdfIn PDF document text
    • https://tinonerapize.weebly.com/uploads/1/3/5/3/135349756/5267593.pdfIn PDF document text
    • http://gk-kuban.ru/kotutofosukopikjjgec.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/iiiehji/president_simulator_pc_download.pdfIn PDF document text
    • https://cdn.sqhk.co/suxevevagova/gDP8zUm/39518046009.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/dupula/new_movies_2019_bollywood_wapwon.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/56429482167.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/kepodokojifonejurowotetez.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/lycoming_io-360-l2a_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/gesalikaw.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_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 5148 bytes
SHA-256: de6196523ccf3c8a7ec23a46274315336aae7bf185b188a5d37cc6d981aea98f
font_01_sfnt_off0000ff2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2A 10528 bytes
SHA-256: 7ac280ecee3a096c8cdde560d0e2caa841cef62b35214b7561daa4dc2d2e3b60

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