Malicious PDF — malware analysis report

Static analysis result for SHA-256 823d6b7aae754864…

MALICIOUS

PDF

186.7 KB Created: 2021-04-06 13:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cd74b505287688eee0ace4164c81c031 SHA-1: d61c3cd023af6b34d4adca9264df1f7c3386b37b SHA-256: 823d6b7aae754864bdf38f7d34cfd051681cb9261b743035c347d357cf6802fa
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as an external URI pointing to 'https://ponafet.ru/123?utm_term=android+version+9+full+name'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://ponafet.ru/123?utm_term=android+version+9+full+name PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425759/normal_6067aa40844c5.pdfIn PDF document text
    • http://salejozokaboruz.22web.org/96427484228.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379489/normal_6003c14e41472.pdfIn PDF document text
    • https://gefivogixofix.weebly.com/uploads/1/3/0/9/130969648/4376877.pdfIn PDF document text
    • https://zuwuroxiver.weebly.com/uploads/1/3/1/0/131070979/f6de39.pdfIn PDF document text
    • http://kutejovanog.getenjoyment.net/sategakifaze.pdfIn PDF document text
    • https://livadasim.weebly.com/uploads/1/3/4/3/134312527/3656097.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420745/normal_600b5f988a574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500670/normal_602de8cb0298b.pdfIn PDF document text
    • https://judozonax.weebly.com/uploads/1/3/1/4/131454501/58cd48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_601d854eebbb9.pdfIn PDF document text
    • http://gagerovovus.22web.org/miwato.pdfIn PDF document text
    • https://bigifami.weebly.com/uploads/1/3/1/4/131407708/mazeme.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_2aaa9fe9583e43a98cd83f010861d24f.pdf?index=trueIn PDF document text
    • http://fidikaxano.myartsonline.com/losowenemazemokeju.pdfIn PDF document text
    • http://luwunepozu.epizy.com/ielts_speaking_part_1_with_answers_2018.pdfIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_5d9889ad317940dcbb4fe02a608dfc0f.pdf?index=trueIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_246b4e60e2e649c98a1a50fb051a1cf3.pdf?index=trueIn PDF document text
    • http://xarilupinedup.myartsonline.com/zebebosuribodaritoponitam.pdfIn PDF document text
    • http://kesupipipiret.onlinewebshop.net/kogeruraw.pdfIn PDF document text
    • http://japebugusob.epizy.com/kipidisitefubofogeselimu.pdfIn PDF document text
    • http://sinalowus.epizy.com/wevofavoguwebadutok.pdfIn PDF document text
    • http://palakojum.rf.gd/nekagotew.pdfIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_6bcb7cd46f034fa792417be2bb672cd7.pdf?index=trueIn PDF document text
    • http://serezisegani.rf.gd/nasadezakututivanukew.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD0 134684 bytes
SHA-256: 8f1328b3c0c0b918d5c1fb766df2068970ef269229265ce8d38d4bb3a2dbb3fa
font_01_sfnt_off0002993e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2993E 5060 bytes
SHA-256: 5631e87e8ad59767af254011c9a81a6f422bb0eb9c4b72afffbd22fe9422d699
font_02_sfnt_off0002aa53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AA53 10432 bytes
SHA-256: cfadeb926e0c03cbd17a3113c12e8b03f8bf73813b1406b0eaebee594286a873
font_03_sfnt_off0002ce1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CE1E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3