Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc4428fa5daee19…

MALICIOUS

PDF

78.8 KB Created: 2021-03-16 16:05:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1be856b2be655f51d585a8674547aa93 SHA-1: 588e1a206d37ff723b5773bf49fb1f65b3ef51e1 SHA-256: 8cc4428fa5daee19888d741ff1dfb848d22aebfa1804ddd5c76874c46bb1a2c2
126 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, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/wix?keyword=gta+5+apk+ios+ipad PDF link annotation
    • http://nezatarofarix.getenjoyment.net/vexekukomatepivoto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372384/normal_6025ff477fd62.pdfIn PDF document text
    • https://jonumupemusegiw.weebly.com/uploads/1/3/0/8/130874210/tikeb-rububimusog-kiziza.pdfIn PDF document text
    • https://faxezufag.weebly.com/uploads/1/3/0/8/130874059/wabuturezit.pdfIn PDF document text
    • https://sizugive.weebly.com/uploads/1/3/5/9/135993047/zibixogoman-fepenomijisefaw-figopogabux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477638/normal_5fd9f4fb66fec.pdfIn PDF document text
    • http://lawexape.mygamesonline.org/46450754125.pdfIn PDF document text
    • http://vepenuvix.mygamesonline.org/2005_honda_accord_maintenance_light_will_not_reset.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453142/normal_604f9cbed8dfa.pdfIn PDF document text
    • http://namafafiteg.mypressonline.com/10_critical_thinking_card_games.pdfIn PDF document text
    • http://zozamowewideno.mypressonline.com/1059577316.pdfIn PDF document text
    • http://dobofozepop.mygamesonline.org/el_himno_nacional_de_honduras_y_sus_7_estrofas.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/how_to_change_my_verizon_jetpack_password.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446494/normal_602fc057ad634.pdfIn PDF document text
    • http://sesesuruko.mypressonline.com/what_is_the_magnitude_of_static_friction.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403556/normal_6007b106e1510.pdfIn PDF document text
    • http://mufosubofamar.mywebcommunity.org/zabuberudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490366/normal_60500ccf9a265.pdfIn PDF document text
    • https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/bimewukat-soledemisadoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuxubakelixuzot.atwebpages.com/79593628133.pdfIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_12498177268d41ea94f914def609c75a.pdf?index=trueIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_b272befa448c48669ce31e94a7ea0327.pdf?index=trueIn 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_off0000f73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73C 5044 bytes
SHA-256: 024bee42f41b54932cd13377e14e3fa94a8b9c301d3def241162d505e4e25d3b
font_01_sfnt_off00010882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 10860 bytes
SHA-256: 5d0c1fef1c4f6c039c3107376ad0a58379a0e8cac4f82d2220952a08f450a05a

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