Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5f1cd9fd18ef14…

MALICIOUS

PDF

100.9 KB Created: 2021-03-30 16:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7a4f67c2be4a0e5ef51538faea48ae94 SHA-1: 55bc88c63fabc0baec4db57c028080fbade15b5e SHA-256: 7e5f1cd9fd18ef14aab6923a4460c6db35166aba96192d3764767a8ba0ddb599
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=autonics+mt4w+manual+espa%25C3%25B1ol+pdf PDF link annotation
    • https://zuparimetusu.weebly.com/uploads/1/3/1/3/131378993/4770447.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/gegga47/uses_of_computer_in_entertainment.pdfIn PDF document text
    • https://pipedexow.weebly.com/uploads/1/3/4/8/134852679/jidomobatokemukomu.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/zn2Pxhi/22035715905.pdfIn PDF document text
    • https://cdn.sqhk.co/rimudatige/l7Cv4G2/51207005335.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/hSgivUw/untouchables_caste_name.pdfIn PDF document text
    • https://mofegagopabelem.weebly.com/uploads/1/3/1/4/131438130/bozufedo-fitelozedu-nuzuvuremos-mevitunusoziv.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/soposexejoko.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/cijcNpF/lavebariluvozeta.pdfIn PDF document text
    • https://nigiseza.weebly.com/uploads/1/3/4/4/134462574/tazatizogo_divitor_norulajizi.pdfIn PDF document text
    • https://nogekapufininut.weebly.com/uploads/1/3/3/9/133997605/sinunenudunag-ripukefasezuva-zepajefi-xalekuni.pdfIn PDF document text
    • https://renezotutumiw.weebly.com/uploads/1/3/5/3/135343322/39c425f8a.pdfIn PDF document text
    • https://sulovuve.weebly.com/uploads/1/3/5/9/135973568/6646032.pdfIn PDF document text
    • https://vojizozovogimum.weebly.com/uploads/1/3/0/7/130740342/bisixefigegi-kitotilazof-runemoxozewofoj-muwodagalu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kapizepaninufo.epizy.com/xoxifatijovumek.pdfIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_3de2ef97984b43b9b790b492b97e4794.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2ef59ee-ea0d-4ca5-9adc-11643f495ff6/37154695098.pdfIn PDF document text
    • http://padekapekalerel.rf.gd/tupofuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae41dfd4-9603-4ef3-a23c-d3454d824989/46767411288.pdfIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_77d2dad64c8647c2862e2326c19eb3cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/965748e3-76c9-42d3-b634-6ac9ca0b2b08/windows_server_2012_r2_support_ende_datev.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D9 4312 bytes
SHA-256: 1154e065f76c6cd15878581109ddc21e6fd6573ae46d89214cc3fbbfb2bf98f4
font_01_sfnt_off00013702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13702 5584 bytes
SHA-256: b02b9d2d2cd6104fa3e4d60e93f89c784e5ec62fe845db19d8ca7716609226e4
font_02_sfnt_off000149cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149CC 20328 bytes
SHA-256: 83803d40dbf09d4c2f261bb9cb3e1052ee32edd1bde89d509af35cefa2211502