Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17bfc9548e4031a…

MALICIOUS

PDF

74.1 KB Created: 2021-03-11 23:13:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ec61a5b774a39ec236cc573724c67aa9 SHA-1: 4de63b4b1bf9a4fcd4e3bb034547440aecb5243c SHA-256: d17bfc9548e4031a9a5f5d94beb9de2ae16a197cb4dd2f79dafc55dbeee82b84
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site for further exploitation.

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://mezovuduw.ru/strik?utm_term=english+grammar+book+app+download PDF link annotation
    • http://walkover.me/932333334047q2yh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385647/normal_5ffd3c3d21ee7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448550/normal_6026d3c205a9c.pdfIn PDF document text
    • https://jowapiwinutakun.weebly.com/uploads/1/3/4/3/134365581/c3fd68b8b51e0.pdfIn PDF document text
    • http://vashastrahovka24.ru/wumabojopudyz6j5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467287/normal_60463f8b9cab9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410679/normal_5fff4fb68757b.pdfIn PDF document text
    • https://naxozafo.weebly.com/uploads/1/3/1/4/131483391/4880715.pdfIn PDF document text
    • http://negitib.iblogger.org/36733014533.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vetuvadoxawiton.epizy.com/jugowi.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/coliformes_definicion_wikipedia.pdfIn PDF document text
    • http://retetopipazaned.epizy.com/muzeketimuxezenapiforub.pdfIn PDF document text
    • http://rekitajutori.rf.gd/mavaso.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/how_to_use_garmin_gpsmap_62st.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_off0000e3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F5 5628 bytes
SHA-256: b65dbe12fdeb675a3f8feee167892b8d614398b70a60c3fb281e1470eb095379
font_01_sfnt_off0000f6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FA 10640 bytes
SHA-256: 5c3e8a9bd6e38b20e72010033786d9044cb982a97d6681c743a521abdd5e86f1

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