Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca69a16c302929c…

MALICIOUS

PDF

76.0 KB Created: 2021-03-25 17:01:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 003c9f42d27385d8b39f4b888c7b9207 SHA-1: ae4f8c9cdf13e2891fd53f475cfa0c0155348a0b SHA-256: 3ca69a16c302929c9b6e0e3c375ea32570f89c1b612068e031a851a8f05a9e65
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. The embedded URLs point to various disposable hosting services, likely to obscure the true malicious intent. No scripts were extracted, but the presence of numerous external links indicates a potential for redirecting users to malicious sites.

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://zajinet.ru/wb?keyword=how%20to%20troubleshoot%20a%20mini%20split%20air%20conditioner PDF link annotation
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/vabazavetok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453537/normal_600e5dfb3eb7a.pdfIn PDF document text
    • http://gebojiwikidavu.iblogger.org/45396449417.pdfIn PDF document text
    • https://cdn.sqhk.co/pakebisas/dgchjib/92009442094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380084/normal_601174e2f3ae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390999/normal_60437f7bb6376.pdfIn PDF document text
    • https://cdn.sqhk.co/divojimo/2ia8The/69472805183.pdfIn PDF document text
    • http://zaruxejubo.iblogger.org/how_to_thread_a_janome_my_excel_18w_sewing_machine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422147/normal_603fed70b5872.pdfIn PDF document text
    • http://jofijuke.22web.org/sims_3_pets_xbox_360_challenges.pdfIn PDF document text
    • https://teligodinawam.weebly.com/uploads/1/3/4/4/134457670/7492013.pdfIn PDF document text
    • https://cdn.sqhk.co/wisewuguv/ihgherT/tazumared.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/murudute/53937621796.pdfIn PDF document text
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_b1f1f28e14c946339df07ac9cfa407fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/11391325300.pdfIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_5cec9879364f424d813b2878b8713851.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/is_it_ok_to_read_quran_in_transliteration.pdfIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_12306edd4a544aceb90127fef439d5ab.pdf?index=trueIn PDF document text
    • http://sugizujesel.epizy.com/kali_linux_wifi_hacking.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0B 5504 bytes
SHA-256: 8ca238d4921b400046d2a4d106bf00ddaee5eb3a3d83bac8247e7e882200fba6
font_01_sfnt_off0000fd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 10836 bytes
SHA-256: 3fc33e78011a05ca1a3006a3ef4fec4ffca17e1dff2b6bfd4734190cb2197ee1

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