Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc23fdc1403f7187…

MALICIOUS

PDF

118.6 KB Created: 2021-04-08 06:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6fbff07bb2c8a4f769e43dc60bbb32c6 SHA-1: 53bf2cd7b5037774efb83d9e64d8fe35fc9052d8 SHA-256: fc23fdc1403f7187710079941b65575e0b18ccf12842dcd65e24dccd80ed22c1
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URLs, with a significant number hosted on disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=immersive+display+pro+user+guide PDF link annotation
    • https://dugezuwodovapa.weebly.com/uploads/1/3/0/8/130874298/vululodedixor.pdfIn PDF document text
    • https://pomaxobizo.weebly.com/uploads/1/3/1/1/131163853/sebukezorib.pdfIn PDF document text
    • https://raxuremaxu.weebly.com/uploads/1/3/5/3/135350699/fevowomu-witezikukug-ratawemidi-muxuxavurubono.pdfIn PDF document text
    • https://fizemovumevomuf.weebly.com/uploads/1/3/4/4/134491325/4535083.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/hbDxlD0/62611793622.pdfIn PDF document text
    • https://tevidozeji.weebly.com/uploads/1/3/4/8/134887032/wuwikudunusasawet.pdfIn PDF document text
    • https://kowenijog.weebly.com/uploads/1/3/4/0/134096242/mimudebegowip.pdfIn PDF document text
    • https://cdn.sqhk.co/liwifetil/dNgijhd/sumokupugininuluvuxuba.pdfIn PDF document text
    • https://cdn.sqhk.co/kerametunal/cjdjgcb/30784905602.pdfIn PDF document text
    • https://rejileju.weebly.com/uploads/1/3/4/3/134335231/9166507.pdfIn PDF document text
    • https://didizotaxudip.weebly.com/uploads/1/3/4/6/134619455/833a07b97a556.pdfIn PDF document text
    • https://vapovudinawixe.weebly.com/uploads/1/3/1/4/131437980/35a77fe589.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/a7718509-fef8-4427-837c-f3b10291bfa7/wakatajumenexixafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c9bb213-ba27-4df0-8320-11a96ad1fe4b/why_my_fridge_not_making_ice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5aa98de-36ce-4a5f-bc53-a950fb68aa33/huskee_snow_blower_24_inch_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22423db1-c5fb-4b1d-9d80-8229c59f7e5f/troubleshooting_kenmore_washer_model_110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/349a49b4-7409-4394-8c44-888b5040ad9d/45557767570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72bb9314-f539-4383-bcb0-205442d49ca1/turojolipawuves.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/560cef78-a812-4e32-90e2-df18d3747714/1972_starcraft_aluminum_boat_models.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/983e3b58-c14b-4e71-945a-4310da8a9a3c/lidowebena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b50f69a-f1f7-45c8-be95-0f0c8b5628cf/fezapikusexojekepuna.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC10 53220 bytes
SHA-256: 4b29c349cbd4689790cb14b685e6afd90cd213bfbb5d57f51f0bac35d69533a0
font_01_sfnt_off00018c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C84 1768 bytes
SHA-256: 4fe1f96ba8db5cf35ca47cddaf067669eaebb9c038fc61eabfa1f5836d0fc525
font_02_sfnt_off0001952a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1952A 5380 bytes
SHA-256: 0baba265eb8f26cf8e70d775c789eebe609f98c3524a5a85101f4e084d184db2
font_03_sfnt_off0001a76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A76A 10680 bytes
SHA-256: 29867d90a1ed0b02443c680ddef22b0a8cea2dd5af704d789a42dd0c8a02c10d

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