Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d89187d7504be82…

MALICIOUS

PDF

72.2 KB Created: 2021-03-02 03:20:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 19be29f6ff59353273cb6b86a8f43c52 SHA-1: 0ac6bd6460f076bdc77ca2b9f8592ee3046d46f1 SHA-256: 3d89187d7504be8229d08a495200dac0d45eb5922e50860aa139def532864b68
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, containing a significant number of external URLs pointing to potentially malicious content. The ML classifier and ClamAV also identified it as malicious. The presence of numerous links, including those on disposable hosting, strongly suggests an attempt to lure users to external sites for phishing or malware delivery.

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://gimoguvi.ru/strik?utm_term=how+to+farm+engineering+materials+elite+dangerous PDF link annotation
    • https://nifatukipukixe.weebly.com/uploads/1/3/1/3/131398430/ba0410c.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/XfHYge9/3d_block_letters_drawing_1_point_perspective.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/hTWicMk/lizipop.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/FjiqgeS/25525737715.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470014/normal_6004899815b20.pdfIn PDF document text
    • https://cdn.sqhk.co/firumefetev/1c3hgij/fefirelawilanem.pdfIn PDF document text
    • https://gokepitamewema.weebly.com/uploads/1/3/5/3/135325242/8ff0f4.pdfIn PDF document text
    • http://halfraire.xyz/wanivafilaruwarafatusgbbwo.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/CuZgjhj/ziwidetatipijikajopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465125/normal_60388b2b889fc.pdfIn PDF document text
    • https://kokilanoru.weebly.com/uploads/1/3/4/0/134012510/356961b0bd.pdfIn PDF document text
    • https://vipegiwofavagob.weebly.com/uploads/1/3/5/3/135302795/sarosapukeno.pdfIn PDF document text
    • https://malufatagu.weebly.com/uploads/1/3/0/8/130874424/wisunojifarobar_gufez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tevigotu/toxizigavu.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_off0000ddad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAD 5280 bytes
SHA-256: 484c15caa5f1e3c4dcd80a1373888acbf3e69743ddbe96e2977fcd489c872920
font_01_sfnt_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 10564 bytes
SHA-256: 6d57140788fadddbe3b07479e7bdc52fe5b72d194f91c8a7b883ebd8b5f64186