Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ba26de4896358c…

MALICIOUS

PDF

70.8 KB Created: 2021-04-04 10:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 121034ac0d8b6af76d7578cfa64875c3 SHA-1: 175369a44f664fe172c891097421135a3aa377ba SHA-256: d4ba26de4896358c41a256783c89c94e98a712b324171d67c97cdf439eb3ad22
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of 'utm_term_redirector=True' and the URL structure further support a phishing or malware distribution vector.

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 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=how+do+i+identify+my+rocks
    • http://wowofiluze.22web.org/rozawewovojize.pdf
    • http://megopoveguvujal.medianewsonline.com/82696885371.pdf
    • https://static.s123-cdn-static.com/uploads/4465389/normal_5fffa29214489.pdf
    • https://static.s123-cdn-static.com/uploads/4384045/normal_60076c50a8f03.pdf
    • https://cdn-cms.f-static.net/uploads/4467975/normal_602b91e4b26a1.pdf
    • https://cdn-cms.f-static.net/uploads/4484834/normal_5fd1f3a8a4ed9.pdf
    • https://cdn-cms.f-static.net/uploads/4459025/normal_604a27f85c5e3.pdf
    • http://gibelepij.scienceontheweb.net/unlock_tracfone_iphone_6_free.pdf
    • https://cdn.sqhk.co/kewukapugino/bYMlnXn/79261885728.pdf
    • https://cdn-cms.f-static.net/uploads/4426549/normal_60143c40efa14.pdf
    • https://cdn-cms.f-static.net/uploads/4443362/normal_6060fadc9f3bc.pdf
    • https://cdn.sqhk.co/fapewakuw/gxshMUV/73041723169.pdf
    • http://kejumazinanu.mywebcommunity.org/javascript_tutorial_free_download.pdf
    • http://rewokujow.scienceontheweb.net/kadambari_file.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fuvuvadut.onlinewebshop.net/fakefofisagewuwu.pdf
    • http://pomuvoxibi.epizy.com/zikoxapidosewoxekiris.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da5f.bin
51d8463c0d9db07b9d24fdab7cf6dab30677f644e33f357d6d57a5352d866504
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5F 5144 bytes
font_01_sfnt_off0000ebe9.bin
371b275fe39d980613985d0fdce202c83492c88bccf48170ae96462d6ad69cef
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 10076 bytes