Malicious PDF — malware analysis report

Static analysis result for SHA-256 46fdb19b4b34354e…

MALICIOUS

PDF

81.0 KB Created: 2021-03-17 18:06:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9567d43fbf61d387166675c59496dcb1 SHA-1: 5b736d8b954a6472f2479463b855be0b6cee33f8 SHA-256: 46fdb19b4b34354e7e8460e7612cdba420461091ce425fb729a0a3312aec8969
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These links point to various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The primary attack pattern observed is the creation of a link farm to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://xezojetit.ru/wix?keyword=head+first+networking+pdf+github PDF link annotation
    • http://digitalmedialit.com/building_cladograms_figwort_family_w7r37e.pdfIn PDF document text
    • http://kelnoteres.xyz/myers_briggs_infjyxjk0.pdfIn PDF document text
    • http://nafepuzemobir.sportsontheweb.net/mapa_geologico_del_peru.pdfIn PDF document text
    • http://herss.space/avg_pc_tuneup_2017_unlimitedzez8j.pdfIn PDF document text
    • https://wuvipovuzodex.weebly.com/uploads/1/3/4/8/134846945/dupefawixiboxomasox.pdfIn PDF document text
    • http://murimubijejaba.mygamesonline.org/bemomelosajiwoxugoneb.pdfIn PDF document text
    • https://tixaradizu.weebly.com/uploads/1/3/4/6/134652762/jegutisiwexi.pdfIn PDF document text
    • http://indital.fun/29558657344187is.pdfIn PDF document text
    • https://fugunukotuji.weebly.com/uploads/1/3/4/5/134589730/44a0049c017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_84878c09644e49ca8f7e1f1c31177493.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ade837c4-a358-49e4-b5da-4b2ad789443f/biwadij.pdfIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_6a4a4557467f49d5a0bab262f234283b.pdf?index=trueIn PDF document text
    • http://vapedefomagejev.epizy.com/7698954334.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90ae7e26-5beb-4ecf-bb3a-83b9817d388c/introduction_to_management_accounting_answers.pdfIn PDF document text
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_565fd45a47ce4927a90a47e4d23c540d.pdf?index=trueIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_a277799e0ccd4ac0b7891dcedd0d9094.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e47db4f-da92-4fa5-831c-33adec038bec/59602412831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66210be6-5ac3-4b0d-9a83-33e93c829d2d/hp_lj_p1606dn_toner.pdfIn PDF document text
    • http://kijekamazeju.epizy.com/business_professional_attire_vs_business_formal.pdfIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_e55afdcc7c4c44ecbfabba671eb37314.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_off0000f3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 5528 bytes
SHA-256: 8a7c0d1694d0f132ca7503af2193d07a1ac4aa063802fa027a7f8ba1841b6b73
font_01_sfnt_off0001068d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068D 19196 bytes
SHA-256: cf5ff2db063ef5b5b6ac882139812e7086ea8cc28924082e5a69d42e32fbaf77