Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1b16d9ae4c9911…

MALICIOUS

PDF

118.6 KB Created: 2021-02-06 07:50:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f583f9d30bbd00ad9577a2407dfad099 SHA-1: 0afca1d55d2d54ddc50ed1b71759b3ec871d480a SHA-256: 0a1b16d9ae4c99119f2712290a818589a90ed4cd736255c1208a3efed1a61340
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9502

Heuristics 4

  • 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
  • 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://jottigo.ru/aws?utm_term=information+mathematician+srinivasa+ramanujan PDF link annotation
    • https://rotaxavevun.weebly.com/uploads/1/3/4/8/134884867/sebuvabazatex_kuvaw_kejaz_nirusu.pdfIn PDF document text
    • http://xogefod.iblogger.org/printable_list_of_anti_inflammatory_foods.pdfIn PDF document text
    • https://sadepejeriroxet.weebly.com/uploads/1/3/5/3/135337628/jopupofabamibi-napib.pdfIn PDF document text
    • https://cdn.sqhk.co/pikuworano/cieyuGQ/soccer_ball_juggling_trainer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382429/normal_5fd7903733458.pdfIn PDF document text
    • http://lasabobobatir.22web.org/97157262821.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426407/normal_5fcd5deaa4da4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479235/normal_5fd7710bef484.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bobitemobo.epizy.com/dipusajozurenizevut.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/nutrition_information_bengal_gram.pdfIn PDF document text
    • http://wojixefem.epizy.com/13797616951.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/taromurugakuxelud.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/ludilumizezinox.pdfIn PDF document text
    • http://zarenubopopo.epizy.com/sokogupuvevivolugonafog.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ab41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB41 5044 bytes
SHA-256: f206a0e15669242db0a9b85e5fea3930fa65a3f852bf6e4e5182476241f04961

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