Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f38625f7ab3383…

MALICIOUS

PDF

76.4 KB Created: 2021-02-20 01:41:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cc6369a8694c2df81d6a235b603b9eae SHA-1: caa530676f71bf3b74aa66ca334d59578a3b0df8 SHA-256: e1f38625f7ab3383b66c4b1bcb3f909e6910b78958bc724a12abd7c159b5944b
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain keywords related to pairing devices, likely a lure to disguise the malicious redirection.

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=how+to+pair+soundpeats+q12+with+iphone In PDF document text
    • https://xonufukagupunim.weebly.com/uploads/1/3/1/3/131384400/9918837e7fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417995/normal_5fca4964aff0e.pdfIn PDF document text
    • https://bezesigut.weebly.com/uploads/1/3/2/6/132681157/2edd0f44ad.pdfIn PDF document text
    • http://bbflowers.net/volume_cube_counting_worksheetslboxh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463034/normal_5fd172cd6a71a.pdfIn PDF document text
    • http://chambrehq.xyz/viwumuvexufugakaliroddoxky.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462726/normal_60132fd731c4a.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/h9glhyB/addison_rae_dance_videos.pdfIn PDF document text
    • https://wuzitefagoxu.weebly.com/uploads/1/3/1/8/131856046/6850703.pdfIn PDF document text
    • https://figalinob.weebly.com/uploads/1/3/1/8/131871825/wevanezelema-mujuritum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426280/normal_5fc97adb0fad1.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/vebogotexaf/potitasegefederowuti.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/carbenes_and_nitrenes.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/brother_mfc_240c_driver.pdfIn PDF document text
    • http://feduneve.rf.gd/85998943165.pdfIn PDF document text
    • http://beposutixavi.epizy.com/ralavasanozatuvizenaj.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_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 5380 bytes
SHA-256: da0303720855501de98ebe6fb22ea3830ae4a6cb0941bfd9c0293172fed83563
font_01_sfnt_off0000fdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD2 11304 bytes
SHA-256: 530360b6d7df8781fcf564d817285b2dde8de6ac702c616c1260b28c8fbedcd9

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