Malicious PDF — malware analysis report

Static analysis result for SHA-256 a540e2f0fe249000…

MALICIOUS

PDF

74.6 KB Created: 2021-02-20 03:57:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 85c432bf7f5195fe0946e76da0d55ccd SHA-1: 815535accabb8e18f1f215157e02e91d6ff64857 SHA-256: a540e2f0fe249000c82d0e49654e5acfdaa397cb877395fefa2fe357a593bbca
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, with a primary one pointing to 'seumenha.ru', likely serving as a lure for users seeking firmware information. The PDF structure and embedded links suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=chuwi+hi8+pro+firmware PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386084/normal_5fdee39b84ae0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376086/normal_600932ac3b4cf.pdfIn PDF document text
    • http://you-bestshop.xyz/243238024175ntoo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486374/normal_600d8ac200ef0.pdfIn PDF document text
    • https://cdn.sqhk.co/telazaje/hjLfYfX/vuposuparek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460060/normal_5fd60ccfd6702.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunudixa/fjchfii/vunonilov.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/heIjeRC/fikopudojepexiri.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/6058619.pdfIn PDF document text
    • https://mipurokuniveg.weebly.com/uploads/1/3/4/5/134508865/dinovax.pdfIn PDF document text
    • https://lomekizawulom.weebly.com/uploads/1/3/4/7/134704223/6f025.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417403/normal_5feca27d404c6.pdfIn PDF document text
    • http://reduslim-buy.site/tubidy_free_mp3_downloads_for_pcbfabo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499629/normal_602a37ac15c66.pdfIn PDF document text
    • https://modevibivuruwix.weebly.com/uploads/1/3/1/4/131406629/jutizaroz.pdfIn PDF document text
    • https://cdn.sqhk.co/sepexapubu/sT98Qhg/mini-_putt_scorecard_template.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/susonanezaj/77288526916.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/38203818456.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_off0000e4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FF 5120 bytes
SHA-256: 29832576596a12aee339e14655eac260873434fbca1cdc7757a6001b7152043b
font_01_sfnt_off0000f652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 11492 bytes
SHA-256: 0feb61fcb685cb0137f323e951e460e39b9154994f74eaee342407cba89afb69

Open this report in the interactive analyzer, or submit your own file for analysis.