Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b34f22e251c0b5c…

MALICIOUS

PDF

112.4 KB Created: 2021-04-04 10:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 77a6e3217d87f6229792d6b36a841d14 SHA-1: 0b13146ad8d3481daf54403965d48af737dfd35f SHA-256: 2b34f22e251c0b5cbf40391af4e1b92b13dd6331958d03fe5450d9fb2dbddc96
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/award?keyword=alphabet+in+german+pdf PDF link annotation
    • http://ygrash.website/roxewot88msh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389107/normal_60397a2c4d0bb.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/bPgcz88/86006677564.pdfIn PDF document text
    • http://lg-supportteam.com/77880565358291we.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381534/normal_6060e5064059d.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422909/normal_5fd888c42bc3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375890/normal_5fcaed72c8ebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388272/normal_60666c4ade15e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499653/normal_5fd7c441126d6.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/ihalnM3/tie_dye_crocs_with_pink_fur_inside.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411270/normal_6067f4d24b9cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a867a740-3546-49c9-bb92-c76f735cad7e.filesusr.com/ugd/c312ff_57b7c13a24974850b8546c26d58ff40c.pdf?index=trueIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_90cca43230c746e78e981dea74226662.pdf?index=trueIn PDF document text
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_429909f95b644efaa05246dcc3045f71.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce00f1ec-86a7-4fa8-8b5f-2731d6be0515/5360594781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fb40e73-f58f-4865-add1-6244a624a329/nedusesuworakulugewariril.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3510566-99f0-4fb9-8508-5f235ebbff81/can_you_get_american_truck_simulator_on_xbox_one.pdfIn PDF document text
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_2025ebe7f4544647ba178cdca60bfe92.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/11993264-be32-4e4b-8fde-bd05f7ba3700/25682873920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f564d6d-14b1-4d43-92f8-dca6899df724/geralds_game_netflix_review.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_off0001554f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1554F 5408 bytes
SHA-256: 4314d8cd63aaaeb930229f50b8b96e80fb35abcdf0ab2ee34ae1d65332d10a03
font_01_sfnt_off00016785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16785 17776 bytes
SHA-256: 61bce4882e61401eeaf7686af60f70803e4c95cbf627ecc486acf5ae3e083d2f
font_02_sfnt_off00019f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F3D 16116 bytes
SHA-256: 6fffb1aeb89666cbcaec4ce24454e19e9ad5757041bd2745d7057949fb60916b