Malicious PDF — malware analysis report

Static analysis result for SHA-256 026a97716e2c5984…

MALICIOUS

PDF

75.1 KB Created: 2021-04-29 18:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: bacb5fb525717cd9d1b0d50753b38da2 SHA-1: 0f3225b8e25ad4dc7cf9d2411204fbad42246850 SHA-256: 026a97716e2c59846ad6d97facae0207c798b9892715493382d449e3527efc92
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with several pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/strik?utm_term=ridgeway+registered+serial+number PDF link annotation
    • http://xupenirulavep.iblogger.org/lemon_law_guidelines_nj.pdfIn PDF document text
    • http://zegevuk.22web.org/how_to_clean_filters_on_dyson_cinetic_big_ball.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448980/normal_5ffb4e9acf5cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466166/normal_600495be4ac82.pdfIn PDF document text
    • https://lerusebarumawod.weebly.com/uploads/1/3/4/4/134478547/754cfd41d75.pdfIn PDF document text
    • https://zububeto.weebly.com/uploads/1/3/6/0/136082076/727036.pdfIn PDF document text
    • https://zobujopexa.weebly.com/uploads/1/3/0/9/130969678/c8b4ef1e1.pdfIn PDF document text
    • https://fexemefamerera.weebly.com/uploads/1/3/4/2/134236105/63c5070e.pdfIn PDF document text
    • https://vinofuloro.weebly.com/uploads/1/3/4/8/134850824/6757757.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_02a9bfde3e0e447395012c549b8fd1db.pdf?index=trueIn PDF document text
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_2f79efa068fc41eb9c0c8ce26d6892b4.pdf?index=trueIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_5a3e6e905d23430fb616ef931ec379c1.pdf?index=trueIn PDF document text
    • http://todetizos.epizy.com/73252876164.pdfIn PDF document text
    • http://bewefesa.epizy.com/sogobitiposumemiz.pdfIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_b2b2bb3b8ffa4ba7a527d7cd50675712.pdf?index=trueIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_352ae319a7bf45a5b48cc6635a099481.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/najipavez/wubon.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/hsc_marksheet_2019_dhaka_board.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/el_aleph_seeds.pdfIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_b90b5c1fc92a444abb618f6dd6cf0ec0.pdf?index=trueIn PDF document text
    • http://bazokupakem.epizy.com/83512555126.pdfIn PDF document text
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_7f3edbc341e746e291c8d5119e1ea91d.pdf?index=trueIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_1451d96641604d21b2e5653acd7c1c68.pdf?index=trueIn 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_off0000e89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89F 5488 bytes
SHA-256: 3823184b9ef8e3374f48a729202af0c547a619a4c3f84d1d9c2980e732e04bcf
font_01_sfnt_off0000fb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4F 10424 bytes
SHA-256: d7700f016e14783ee806b48b3cc80b325d4ce5d172d8fc72de1b3f03166481d3