Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4296caaa0816cd1…

MALICIOUS

PDF

85.8 KB Created: 2021-05-30 11:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c67c1694d0d5164396fe8fcde41a1575 SHA-1: 9a2c50eca2e300634f30c8caea817ea43c51699a SHA-256: f4296caaa0816cd1366ccaafd8d02e2b087cafad9a051f39096de91be48d4243
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical PDF_SEO_LINK_FARM rule, indicating it contains a large number of external links. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The presence of numerous external URLs, such as https://lozipotod.ru/123?utm_term=biogeography+upsc+pdf, suggests a tactic to redirect users to potentially harmful sites or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/123?utm_term=biogeography+upsc+pdf
    • https://vurusewotuludi.weebly.com/uploads/1/3/0/7/130739344/sifamovimuxew-pawaji.pdf
    • https://cdn-cms.f-static.net/uploads/4453335/normal_603855999fa9e.pdf
    • https://cdn-cms.f-static.net/uploads/4462992/normal_601d448ed47cf.pdf
    • https://dujejasafat.weebly.com/uploads/1/3/0/7/130739214/monudanobizumepixo.pdf
    • https://tagudosalanuku.weebly.com/uploads/1/3/1/4/131452811/raner.pdf
    • https://nirixebuwema.weebly.com/uploads/1/3/5/9/135990662/28b4f58a.pdf
    • https://judetali.weebly.com/uploads/1/3/4/7/134723341/gunesi.pdf
    • https://kuduxuke.weebly.com/uploads/1/3/5/3/135323303/timivix_nezobare_rugowibi_sujofog.pdf
    • https://ratanamiwul.weebly.com/uploads/1/3/4/3/134327333/zezorobufunekululiz.pdf
    • https://rarekupop.weebly.com/uploads/1/3/4/0/134012473/6344717.pdf
    • https://simogewijak.weebly.com/uploads/1/3/4/6/134642120/e7144e156f.pdf
    • https://zobatovegu.weebly.com/uploads/1/3/0/8/130873738/4823185.pdf
    • https://pavimukafimedab.weebly.com/uploads/1/3/1/4/131483282/kileluzamul.pdf
    • https://zexivavu.weebly.com/uploads/1/3/4/8/134872555/5458855.pdf
    • https://mumimobubaw.weebly.com/uploads/1/3/4/6/134640569/bexaru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6b2eaea7-7370-4d3f-a756-336e15006f6b/reromozukuda.pdf
    • https://uploads.strikinglycdn.com/files/1f8cf770-d80e-4dee-8160-a33f561a3b11/ruvaferutive.pdf
    • https://uploads.strikinglycdn.com/files/38780dc8-4269-41e3-b29f-4e7a8c500c40/zigafesukof.pdf
    • https://uploads.strikinglycdn.com/files/48c27abd-0b76-4cfb-8bb4-a90784c9479b/79627876701.pdf
    • https://uploads.strikinglycdn.com/files/8a301d99-801e-4958-8762-5b9535011351/ledoxagipekowen.pdf
    • https://uploads.strikinglycdn.com/files/238acdc1-c35e-44a1-83e5-64a95bb1f80d/58148994823.pdf
    • https://uploads.strikinglycdn.com/files/dbaba40f-5a48-4f67-bc1a-8531cf0e0ec2/73224061793.pdf
    • https://uploads.strikinglycdn.com/files/1e461bc6-eb03-4102-ad38-1e11650584c7/us_navy_gunners_mate_salary.pdf
    • https://uploads.strikinglycdn.com/files/642dd07f-3a99-4414-8aa2-6990456a9d85/what_does_an_international_lawyer_do.pdf
    • https://uploads.strikinglycdn.com/files/c997b5d2-7ead-4b15-9993-24383b069cb7/is_comptia_a_for_beginners.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108e3.bin
b4ec559e14215a315633efe817a83ee2bf0cb6ebdebaebd7d47c6e22ecdd3726		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108E3 5536 bytes
font_01_sfnt_off00011bb8.bin
6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB8 1800 bytes
font_02_sfnt_off00012448.bin
78e52296817b1a3d01a1989b27ed260f75885023636ece18b24403c94e81d007		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12448 10820 bytes

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