Malicious PDF — malware analysis report

Static analysis result for SHA-256 9320dc83ad9e388c…

MALICIOUS

PDF

77.8 KB Created: 2021-05-18 21:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: dddbfe45e1abefcd5aa3283f64f39aff SHA-1: 998cbd837a209a88bc3e0de3cac97d2b19e844e8 SHA-256: 9320dc83ad9e388cbd3e25658f7124e797881709038f4ef3f747902b2fb2fc04
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=test+psicometrico+cleaver+pdf PDF link annotation
    • http://ralenexixozuk.iblogger.org/tezuse.pdfIn PDF document text
    • https://wegenagozej.weebly.com/uploads/1/3/5/3/135394478/nanesanuru.pdfIn PDF document text
    • https://pimotaro.weebly.com/uploads/1/3/3/9/133986821/sesuzonojaxudoxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403556/normal_5fd2cec4aebc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_6021407221148.pdfIn PDF document text
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/tulewazilipe_ragalone_barawan_nudefurumoxuwew.pdfIn PDF document text
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/9941098.pdfIn PDF document text
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/64ac0.pdfIn PDF document text
    • https://fafafavavilaba.weebly.com/uploads/1/3/4/8/134893162/mejegekorujezobuvar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453118/normal_603246a4c5d99.pdfIn PDF document text
    • http://wuvudazesog.22web.org/flowchart_definition_in_computer_programming.pdfIn PDF document text
    • https://kukonite.weebly.com/uploads/1/3/4/6/134611202/50625bdbb2e1a1.pdfIn PDF document text
    • https://radamokugek.weebly.com/uploads/1/3/2/6/132696621/jovur.pdfIn PDF document text
    • https://sanokigoj.weebly.com/uploads/1/3/4/8/134863934/5991148.pdfIn PDF document text
    • https://biputivaninude.weebly.com/uploads/1/3/1/4/131438500/fesege_gukule_jonuzevuk.pdfIn PDF document text
    • https://nozoporunetub.weebly.com/uploads/1/3/0/8/130814805/7235329.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/dalava/lanasibifovasogufugo.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/hollywood_movie_tamil_in_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/nebotiv.pdfIn PDF document text
    • http://ruzovufu.epizy.com/camille_lol_guide_top.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_off0000ecce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 5312 bytes
SHA-256: 927fa18ec1e0c3a3ae0c8cd2d45656fc5c077ec783d4a27f99bccb8c90eb4e84
font_01_sfnt_off0000fecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECF 12808 bytes
SHA-256: 4ed7e6052360c86a297d14753cb86134c1163dc00ed9eb7069f4969b4eac9868