Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51e71073b4d557a…

MALICIOUS

PDF

79.3 KB Created: 2021-02-15 11:51:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0683c144498ae01231a9928279e20191 SHA-1: 29e1a00e0a45c0c26f90ad3e50c8294800df4315 SHA-256: c51e71073b4d557a85d10bee016a2b2712fb1c41050c8d9fc455b1b545933227
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable or used for SEO link farming. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites.

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://leonvi.ru/wix?keyword=cstephenmurray+answer+key+types+of+forces PDF link annotation
    • https://pofomagod.weebly.com/uploads/1/3/1/4/131483550/dorokiwabed-kiduzelulu-bilopovekoselap-sepizunikikuvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5fd6584fe3cef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481667/normal_5ff9432738fac.pdfIn PDF document text
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/xivepimef.pdfIn PDF document text
    • http://familyit.info/lilegabuwy64t.pdfIn PDF document text
    • http://vumoramoguko.22web.org/arduino_software_for_android_tablet.pdfIn PDF document text
    • https://kokazokurazafan.weebly.com/uploads/1/3/5/3/135348127/zetelizakojode.pdfIn PDF document text
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/7549441.pdfIn PDF document text
    • http://vittorguxx.site/27037950275b22oc.pdfIn PDF document text
    • http://itasummer.fun/gta_san_andreas_apk_kurulumsuz85r6j.pdfIn PDF document text
    • https://tatedugede.weebly.com/uploads/1/3/4/3/134311852/ffb2a2d3af.pdfIn PDF document text
    • https://jopazidavasuzu.weebly.com/uploads/1/3/2/6/132681438/553f1c3e.pdfIn PDF document text
    • https://xupukowipor.weebly.com/uploads/1/3/5/3/135304830/2f5522.pdfIn PDF document text
    • http://dasiroxejipi.22web.org/livros_de_augusto_cury_para.pdfIn PDF document text
    • http://modernstyle.pro/milupujosudorenoruwilwbgn.pdfIn PDF document text
    • https://wekupadafar.weebly.com/uploads/1/3/5/3/135315244/3189443.pdfIn PDF document text
    • http://astrohelp.space/mp3_mixer_apk_for_androidsglg3.pdfIn PDF document text
    • https://jurefuzosapob.weebly.com/uploads/1/3/4/9/134901670/5905936.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485822/normal_601f6c624fb52.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://godemesefiw.epizy.com/dojalobabaligav.pdfIn PDF document text
    • http://rolodumom.epizy.com/kixukijazu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 5388 bytes
SHA-256: 38d30ac706ce372e9e24368480803992a0484257417883ed2f14beaa575cec13
font_01_sfnt_off00010ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC8 10440 bytes
SHA-256: 924627d941354ad81a963f35bbf353b8fdc7db48dd508b2a4a3356349624fc19

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