Malicious PDF — malware analysis report

Static analysis result for SHA-256 acaa8db82f381c74…

MALICIOUS

PDF

83.0 KB Created: 2021-05-18 17:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 792a7278c31e29ef5a115b6c44b8e268 SHA-1: 3e8580eb9f7a2c6ec6622f3a796341bd630afefc SHA-256: acaa8db82f381c74ecb0b769efbbaa9f339fb9796c0e45b2e1032caffc543c14
194 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to drive traffic or distribute malware. The presence of a 'download' lure and the ML classifier's high confidence score indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/strik?utm_term=kanakadhara+stotram+mp3+free+download+in+hindi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426085/normal_6046680f808ca.pdfIn PDF document text
    • https://korebamo.weebly.com/uploads/1/3/0/7/130739662/mijibo_mulugawa_nilipug_gaxazabumozikev.pdfIn PDF document text
    • https://wuwiragirek.weebly.com/uploads/1/3/0/8/130874366/6f4e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419437/normal_5fe6c58f6f3a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465685/normal_60180c300a54c.pdfIn PDF document text
    • https://vuzizakepavojen.weebly.com/uploads/1/3/1/4/131484090/16bab765d7e16.pdfIn PDF document text
    • https://bujipivew.weebly.com/uploads/1/3/4/1/134131373/9630448.pdfIn PDF document text
    • https://kuxalureb.weebly.com/uploads/1/3/1/3/131383592/tubalisajevawa_gonesidifojaseb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477638/normal_6012b6526cfeb.pdfIn PDF document text
    • https://divuvefa.weebly.com/uploads/1/3/4/7/134759037/wovopog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369505/normal_605166d8a3c26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474478/normal_5ff419739a83c.pdfIn PDF document text
    • https://kufaxalerix.weebly.com/uploads/1/3/1/4/131453821/4394166.pdfIn PDF document text
    • https://dofonumid.weebly.com/uploads/1/3/5/3/135314870/muledogexovev-fabuxugiwudo-sofuna.pdfIn PDF document text
    • https://sipobazi.weebly.com/uploads/1/3/4/4/134494275/e5b7790d707040.pdfIn PDF document text
    • https://puzelosepe.weebly.com/uploads/1/3/5/3/135317481/durukapalutiza-wesavazatekit.pdfIn PDF document text
    • https://famereruzune.weebly.com/uploads/1/3/1/6/131637342/c2d7fae166a.pdfIn PDF document text
    • https://begiruxuvasepi.weebly.com/uploads/1/3/5/3/135351124/labuzoparirumi-nidaf-worovu-nisanefitejerel.pdfIn PDF document text
    • https://vituxusupodewe.weebly.com/uploads/1/3/1/3/131379836/534333.pdfIn PDF document text
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/mojararabofos-kigakowepu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/663813ba-2e92-4434-8222-dac7bc37388f/what_are_the_four_ancient_civilizations_of_the_world.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ff3a993-8ade-46e1-9525-980a66d1974b/pawujibote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6db6ecc7-6635-4d89-a316-2e02a0b8223e/critical_information_literacy_definition.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 5572 bytes
SHA-256: 6543b04607fc3180280f07f6a8cea2e5147c882de41d0079a566a8909fbf0e71
font_01_sfnt_off000104dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 10996 bytes
SHA-256: 7e1b5a92cf69eaf81f871ee5070b8b4ca47eddea9ff6911ad314680e439aec1e
font_02_sfnt_off00012a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9C 5476 bytes
SHA-256: 27391ee72f685cae2349c6f6de79b2a8dc0658c8d0ca8b66050f1255c415d4ef