Malicious PDF — malware analysis report

Static analysis result for SHA-256 6058d5b923ab69db…

MALICIOUS

PDF

77.1 KB Created: 2021-03-28 19:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13e1abcd6dbc4901bda2805e9e581b1d SHA-1: b8dddf451a1272acdb8c2ac1e6d06ccb7a36fc67 SHA-256: 6058d5b923ab69db4dd048bdafcb77522d8f2545945885813f01926f64b57764
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/award?keyword=loeve+probability+theory+ii+pdf
    • https://mufisifarugevap.weebly.com/uploads/1/3/4/5/134595961/ketopupa-dupexuxoro-waxaxasuvidifif.pdf
    • http://kinoxca.xyz/fiddler_on_the_roof_movie_to_watch_for_freehhaa8.pdf
    • https://cdn.sqhk.co/zarepowake/jieggjf/bar_graph_ppt_template_free.pdf
    • http://nusowutevu.getenjoyment.net/example_of_certificate_of_appreciation.pdf
    • http://good-production17.site/4468916868hfkz2.pdf
    • https://cdn.sqhk.co/nedabuke/amxnYxy/kopokerogobagizuxur.pdf
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/tawodabiwikibix.pdf
    • http://xatakafigudu.getenjoyment.net/jojupefezepamevad.pdf
    • https://gurekageta.weebly.com/uploads/1/3/2/6/132695257/9161982.pdf
    • http://mailedflkf.site/22843429577h5eot.pdf
    • https://finijigif.weebly.com/uploads/1/3/2/6/132681422/9798700.pdf
    • http://zeropium.com/kobukisevulorudimipetgxhae.pdf
    • https://cdn.sqhk.co/fumodolanes/if5jiY9/9111492726.pdf
    • http://tofoxewesaxizuz.mywebcommunity.org/xutakutolixaponesuwafafa.pdf
    • https://janolonixo.weebly.com/uploads/1/3/3/9/133987325/gerurabomad.pdf
    • https://debovibeki.weebly.com/uploads/1/3/4/7/134715081/gitujujoxeve_zivive_wusotumogexe_jazofot.pdf
    • https://wojanoxunoliwam.weebly.com/uploads/1/3/5/3/135394081/xiperepuvuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000ee87.bin
a42cca5487da2eea6002b32d57648b87f8e53bc7a75f8a8d4f594aa27f6d55a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 5196 bytes
font_01_sfnt_off00010037.bin
632e553847d902892f13e9e8e29371bdbaca186d727b86a9303bc2f18cc8540c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10037 12292 bytes

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