Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e1f01faf9f8519f…

MALICIOUS

PDF

82.0 KB Created: 2021-01-24 13:52:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 666cd613e13de43b5410cb77de222995 SHA-1: eee6115b0e69f3ba89089330afa7df65635e00a0 SHA-256: 0e1f01faf9f8519f805f40d6bfffab1a059890ca79a9f061cf7e3ee0f6a9d334
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, with several pointing to suspicious domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_LINK_FARM and PDF_SUSPICIOUS_LINK_LURE heuristics further supports this, indicating the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://jacksth.ru/123?utm_term=world+class+gymnastics+belleville+il
    • https://monezoxikaxusoj.weebly.com/uploads/1/3/1/4/131453753/winaboxavesukujan.pdf
    • https://static.s123-cdn-static.com/uploads/4472793/normal_5ff713567806a.pdf
    • http://fabermanufacture.ru/nba_2k21_mobile_official_release_datedjcvh.pdf
    • http://prodit.space/love_apple_farm_menujkgp3.pdf
    • https://static.s123-cdn-static.com/uploads/4456143/normal_5feb03d069419.pdf
    • https://rebejudan.weebly.com/uploads/1/3/5/3/135316845/gotojig-mukafolanixizul-xupovuz.pdf
    • https://static.s123-cdn-static.com/uploads/4409246/normal_5fe01dc621deb.pdf
    • https://static.s123-cdn-static.com/uploads/4405946/normal_5fee85a8592db.pdf
    • https://nowitapa.weebly.com/uploads/1/3/1/4/131438176/rudusoti.pdf
    • https://static.s123-cdn-static.com/uploads/4412905/normal_60050e890fd3a.pdf
    • https://dudegakabiwuzab.weebly.com/uploads/1/3/1/4/131406663/givajikijomeza.pdf
    • https://static.s123-cdn-static.com/uploads/4461202/normal_6000a7dcd3541.pdf
    • https://static.s123-cdn-static.com/uploads/4465259/normal_5fe2e2b285044.pdf
    • http://managerprogram.live/merge_dragons_wonders_sellhm2xr.pdf
    • https://static.s123-cdn-static.com/uploads/4366402/normal_5fe28a5fa2e47.pdf
    • http://vivadoctor.ru/ginutulanujowoke4an83.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/lokijuronig/sagojod.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_off0000f516.bin
4709f643e20e4375806b22e48ef622da891d6cf9402019e35ee4b2268b3bb4f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 5360 bytes
font_01_sfnt_off0001074b.bin
152836f4bcc1b42e48449ecb82b161a7c84d36e1d13fb248bda3633e55a6ca81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1074B 11556 bytes
font_02_sfnt_off00012b4b.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4B 4324 bytes

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