Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a78e7dc3659b309…

MALICIOUS

PDF

65.6 KB Created: 2021-02-15 06:07:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 94f1cecf44b459e8aed243049604826f SHA-1: 9b5638d76e7afe43d70d7e27a707544f194f3328 SHA-256: 7a78e7dc3659b3093522ffc1a804abb315fe7dedede2b56f608b1ddda8f07cbb
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'Malwarebytes anti-malware remediation tool', likely a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/aws?utm_term=malwarebytes+anti-+malware+remediation+tool PDF link annotation
    • https://wudatoguji.weebly.com/uploads/1/3/4/8/134885495/6094693.pdfIn PDF document text
    • http://taxurofetizi.22web.org/riparian_zone_management_guidelines_tp148.pdfIn PDF document text
    • https://gunulavosaki.weebly.com/uploads/1/3/4/3/134374607/vipujekuzaju-vuwadiwelevole-jevafefikiv-revutogagom.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/jobelefa.pdfIn PDF document text
    • https://bododomeliba.weebly.com/uploads/1/3/1/4/131408614/7894612.pdfIn PDF document text
    • https://reropazorulofo.weebly.com/uploads/1/3/4/4/134437501/f06650.pdfIn PDF document text
    • https://lizatupapej.weebly.com/uploads/1/3/4/4/134401074/3c8343f77d5.pdfIn PDF document text
    • http://peregukejipesa.iblogger.org/gefomixifulevodenopu.pdfIn PDF document text
    • http://tunizunifegitof.66ghz.com/cursive_alphabet_small_letters_practice_worksheets.pdfIn PDF document text
    • http://talobaniwi.iblogger.org/92821970647.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/jjcIjgR/dofajovisezawe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuzudaru.epizy.com/wamudobusajotimo.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/hoi4_german_empire_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/pelumugipe.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/87620943384.pdfIn PDF document text
    • http://lemijafuw.epizy.com/vixetabag.pdfIn PDF document text
    • http://bezopiwuzalobit.rf.gd/persona_4_adachi_social_link_answers.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elemeIn 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_off0000c9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FE 5344 bytes
SHA-256: 64a09300965377d3abd339462a90bc1b661414ed4fe5e230e973bc8126134a47
font_01_sfnt_off0000dc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 10236 bytes
SHA-256: 493cdd24fbdac9752b56ecc65cb53b3c4e43193bbc5933a17ebf5dfbdf992be2

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