Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1ce2c82ad0df50…

MALICIOUS

PDF

84.1 KB Created: 2021-03-19 07:11:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 959f39bcb95e84992cbfe2338ea1f1cc SHA-1: d411175a116acbaa4addc9d71f42b72e19d042c2 SHA-256: 7d1ce2c82ad0df50919df3d1c147140d1b5b7ffb1c38a4dd6d0ede34c25e77e5
206 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or link-farming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=operations+management+degree+jobs PDF link annotation
    • http://dream-stat.ru/7429245231838zth.pdfIn PDF document text
    • https://vewirorerisemi.weebly.com/uploads/1/3/4/6/134627211/3370619.pdfIn PDF document text
    • https://wigobozigor.weebly.com/uploads/1/3/5/3/135345973/6744476.pdfIn PDF document text
    • https://zameleto.weebly.com/uploads/1/3/4/0/134042643/6196986.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/7093567.pdfIn PDF document text
    • https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/likinab.pdfIn PDF document text
    • http://myfoxing.online/seccion_aurea_en_arquitectura_defini796ey.pdfIn PDF document text
    • http://mamontov-net.cc/best_fishing_pole_for_striped_bassr0sa4.pdfIn PDF document text
    • https://wosumugip.weebly.com/uploads/1/3/4/8/134867897/3883299.pdfIn PDF document text
    • https://mozufidapu.weebly.com/uploads/1/3/4/0/134012608/9139887.pdfIn PDF document text
    • http://moneymaya.site/55920306728d0kzh.pdfIn PDF document text
    • https://nagalijas.weebly.com/uploads/1/3/1/3/131398542/8288294.pdfIn PDF document text
    • https://fejurisikem.weebly.com/uploads/1/3/0/7/130740008/nepavulevimap-kijijaro-jipopunopisube-nitirolani.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f54b6cb7-e51a-4238-8eaa-3213b98f44e7/history_alive_the_ancient_world_chapter_25.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe5790a8-e834-4f9b-a330-f1e416362a2f/34596414227.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/zerexukigejawufixu.pdfIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_a35154ad8380403489553db55340e3db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdd92d70-96b9-4d03-acd2-a4f46be3c70b/kung_fury_movies_like.pdfIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_cce2fb24fde0477f9cf50b78b8935402.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/sheet_pan_roasted_broccoli_pasta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbd9355e-658f-4415-af90-c53624e84483/alone_together_cast_season_1.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_off00010941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10941 5488 bytes
SHA-256: 5f1240426bb9ade83370bbc2e6af777d264c491e0f4781095cecfa5a65ed4c1e
font_01_sfnt_off00011bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 11544 bytes
SHA-256: d7b7986aed98bc38e4a13052f6c278f96de43de4ec64fa6a3b9d146f82475652