Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5df141402de844…

MALICIOUS

PDF

77.7 KB Created: 2021-03-27 14:23:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 54eeed84f3e3b35e3d5da9cd1312259a SHA-1: 5661e5b16b2908a6e7516ca4a694b0f7c177e60c SHA-256: 3c5df141402de8444882c0b1e0afb46bb2caaf5167aec6ef3b7140829717646f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/award?keyword=west+african+map+pdf PDF link annotation
    • https://baxelawinojiw.weebly.com/uploads/1/3/4/3/134333718/gagepavosaz.pdfIn PDF document text
    • https://cdn.sqhk.co/vikojovowoso/3jcfRic/67564060912.pdfIn PDF document text
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/5724361.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/azhhH6C/microsoft_word_online_download.pdfIn PDF document text
    • https://juwizezajofop.weebly.com/uploads/1/3/1/6/131637218/zevul-lavaseremum-medopi-jidatisoli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470016/normal_6055b84c4d325.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419827/normal_60049071dcd66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408184/normal_602dc6e22f649.pdfIn PDF document text
    • https://pukizorot.weebly.com/uploads/1/3/1/3/131384201/bodif.pdfIn PDF document text
    • https://dokegofixak.weebly.com/uploads/1/3/0/8/130873830/975d5cfd32e910.pdfIn PDF document text
    • https://wosapinilesodiw.weebly.com/uploads/1/3/5/3/135347506/7665187.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404123/normal_5fe45a6293cd8.pdfIn PDF document text
    • https://gudixujoxidiziz.weebly.com/uploads/1/3/4/8/134857074/vajovirepume.pdfIn PDF document text
    • https://sevafigetof.weebly.com/uploads/1/3/4/9/134902911/zarutotuj_duxadu_masaxegop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463010/normal_605ef4f2ac10c.pdfIn PDF document text
    • https://wujenorap.weebly.com/uploads/1/3/5/3/135322769/jiladogepaxuze-gubumor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_d8437eaf888443bf8a7863767c7182a5.pdf?index=trueIn PDF document text
    • https://e53c8fcc-339b-4d8f-83f6-44ddc8c6ace4.filesusr.com/ugd/1ea9c4_2574123e76624b52bbf06ce1ad8feee6.pdf?index=trueIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_0b0a2add4b454637960388fb93ef451d.pdf?index=trueIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_baa6e40d942a48e886ba0e1c99f967c5.pdf?index=trueIn PDF document text
    • https://c72a6d71-2fad-4f5a-8b7a-a7c165485bce.filesusr.com/ugd/a4966f_aa1d8960f5224eb1ac9cf810c32fb0ac.pdf?index=trueIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_e0bee287b3c2415c9a8a2bc32298fe28.pdf?index=trueIn PDF document text
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_3d2b96e2fccc446a938bc017c3dcab60.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_off0000f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 5284 bytes
SHA-256: 5fe3d6ee39e1a76b1e9afe07cdc286fd7bed910ac34aedf9884d9ece01fffed6
font_01_sfnt_off0001025a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025A 11260 bytes
SHA-256: a48c91b7b7d9d93e8b8face748c8f2413f5711c58db9fe5bd804929154ee553a