Malicious PDF — malware analysis report

Static analysis result for SHA-256 4771a54ea0f63815…

MALICIOUS

PDF

79.9 KB Created: 2021-03-31 18:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e46c203448b0742b665e209309d84efd SHA-1: b32fbbbd9f70f1a78fa5888367a75499f0e9747c SHA-256: 4771a54ea0f638156425e259dc10c8064cd9e5fdfb157263fd77229f66734f69
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://zajinet.ru/award?keyword=bhagavad+gita+as+it+is+prabhupada+pdf PDF link annotation
    • https://guxuxexor.weebly.com/uploads/1/3/0/7/130775085/disekisufok.pdfIn PDF document text
    • https://tetaretutu.weebly.com/uploads/1/3/4/8/134872422/4685195902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370266/normal_6056deb293323.pdfIn PDF document text
    • http://xuxikurov.mygamesonline.org/12545514437.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393626/normal_6059e9d0de7b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409238/normal_604690bd5ec45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369505/normal_602933705ed94.pdfIn PDF document text
    • http://tazizinujumijoj.mywebcommunity.org/79307110369.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492573/normal_6026073e03680.pdfIn PDF document text
    • https://dugezuwodovapa.weebly.com/uploads/1/3/0/8/130874298/2824438.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369328/normal_5ffcdc7b20c83.pdfIn PDF document text
    • https://sujoxiwu.weebly.com/uploads/1/3/4/8/134879933/kipuwevumake.pdfIn PDF document text
    • http://fobexugelego.getenjoyment.net/vastu_shastra_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446781/normal_6031565721074.pdfIn PDF document text
    • https://zefinefan.weebly.com/uploads/1/3/2/8/132816158/vesuriragovi_ropimugasotobup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416666/normal_5fe927af0181e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449973/normal_60603d0805894.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368474/normal_5fdd49dec8f63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476577/normal_60047adeb9c2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488842/normal_602c31eedae10.pdfIn PDF document text
    • http://paruxezogu.mygamesonline.org/always_hungry_david_ludwig_download.pdfIn PDF document text
    • http://ragegid.iblogger.org/98199136474.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vevofiwimim.epizy.com/when_was_the_dell_optiplex_9020_released.pdfIn PDF document text
    • http://tutakaxebi.epizy.com/3294729339.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_off0000f8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 5520 bytes
SHA-256: 5fe968cfbff86959dd6fd3262720b33609e0e65cb756ea3f841962845f3053a0
font_01_sfnt_off00010bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC3 11620 bytes
SHA-256: e74d13a75f00564d81cbe300513acccc0b8014d35e1643ae58aad06b8f6c1b8c