Malicious PDF — malware analysis report

Static analysis result for SHA-256 f213a04326c810ab…

MALICIOUS

PDF

81.4 KB Created: 2021-06-07 03:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 615dd4ef6cb0173238d9185cbe4baea6 SHA-1: b25ed5ff7aef70d3dc1caac7d3614229b6d3e3a7 SHA-256: f213a04326c810ab488493e41cba9ea9226c48063e27e9a5b624ff7658e457bf
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 0.9998

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://archism.ru/pbw?utm_term=teaching+prepositional+phrases+5th+grade PDF link annotation
    • https://buwofapakudo.weebly.com/uploads/1/3/5/3/135316190/mowisumodetule.pdfIn PDF document text
    • https://rizaguvaza.weebly.com/uploads/1/3/4/5/134502188/radilivanijodor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467003/normal_60bc5c8919bbe.pdfIn PDF document text
    • https://jipujiro.weebly.com/uploads/1/3/1/0/131069764/4085376.pdfIn PDF document text
    • https://dawitomow.weebly.com/uploads/1/3/4/4/134439013/kilalemoroka-xuwafajadad.pdfIn PDF document text
    • https://pudijeda.weebly.com/uploads/1/3/4/5/134586696/9617217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420917/normal_60162ad23b4e6.pdfIn PDF document text
    • https://sekirodalod.weebly.com/uploads/1/3/4/6/134673836/bidebosotodopukegis.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4383566/normal_60b4190bc54d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_606e1cdf4025c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418180/normal_6064c850b9543.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/1217077.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459640/normal_6025903635f29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375522/normal_605f38982684c.pdfIn PDF document text
    • https://zokejiwiperasuk.weebly.com/uploads/1/3/4/6/134668939/famox_zafomosav_jopuwuru_zewuwaboweva.pdfIn PDF document text
    • https://dixozetazexode.weebly.com/uploads/1/3/4/4/134472526/401178.pdfIn PDF document text
    • https://luvupomadimudux.weebly.com/uploads/1/3/4/3/134350134/tevibawogawar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/156cb1ba-61ca-459e-aedd-2d9c5e2ef9e2/jasosirisevegikipojogek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8a3e149-1d8c-425f-b17c-f99eb2813916/russian_ball_piping_tips_uk.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 5408 bytes
SHA-256: 903093fcb797d407f81759175455a91d3aae69748aabb36049422dc5d93a412f
font_01_sfnt_off0000fb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8C 11352 bytes
SHA-256: 2f57ac49e997c68f834ad3db919b78553e675d147a29a3809d79dafae964949d
font_02_sfnt_off00012263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12263 16232 bytes
SHA-256: b2cbfceaf44fc4a56d1321c5677f125dfbde6a5f8c873b6a17361dd7c2aa5302