Malicious PDF — malware analysis report

Static analysis result for SHA-256 838a49a3e7a075a2…

MALICIOUS

PDF

74.1 KB Created: 2021-02-22 21:13:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 99e0a413e98fdb46a69fcc98412cee59 SHA-1: cb4a4cd6db0872431a9876c84064f146d043dc69 SHA-256: 838a49a3e7a075a2db34adb45da0c51621fb342992d0e4f54511d0671e96d416
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically 'https://yafferge.ru/strik'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure the user to a compromised site, likely for phishing or to download a secondary payload.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+is+the+role+of+a+prison+warden In PDF document text
    • https://cdn-cms.f-static.net/uploads/4451018/normal_6027f124a5e73.pdfIn PDF document text
    • http://damapilob.iblogger.org/23993140655.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481285/normal_5ff3ea61302e4.pdfIn PDF document text
    • http://lemujivowukita.22web.org/girlfriends_guide_to_divorce_season_6_music.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvovidesom.epizy.com/soothing_baby_music.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/blank_sheet_music_wiki.pdfIn PDF document text
    • http://voralozavudiwa.epizy.com/woburafizuvu.pdfIn PDF document text
    • http://xenuduximowub.epizy.com/keperoguzobosixasonav.pdfIn PDF document text
    • http://misibinebob.epizy.com/candy_crush_hack_apk_200_moves.pdfIn PDF document text
    • http://webibufirug.rf.gd/avdhesh_premi_video_mp4.pdfIn PDF document text
    • http://susesibukof.epizy.com/luvotefowivuguxopexuzezi.pdfIn PDF document text
    • http://mujotipaxoxi.epizy.com/37785863960.pdfIn PDF document text
    • http://bamemuwibe.epizy.com/94855140279.pdfIn PDF document text
    • http://dumatefofexulen.epizy.com/nebomabukufudebot.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_off0000e598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 5232 bytes
SHA-256: 2927599b289de0da9e2d7c9df1d2ffc0e20dd6f2e4fd52fbdf76913ee3a82a18
font_01_sfnt_off0000f778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 10740 bytes
SHA-256: ba004b5c060d0d7b3843b40ad7f0998d4dd22379915feb3dea96530da4302563

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