Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e14502d0d1e7be…

MALICIOUS

PDF

63.8 KB Created: 2021-02-11 23:59:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 83a9b76ee8703000427609a8436b127b SHA-1: e7019a502c304d8254a0d7e6e37bf027a25b45dd SHA-256: 53e14502d0d1e7be787f55deaac7f57ea90073cf717862acc8bb72a324f5b2f9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The presence of a link to 'baarspo.ru' with a keyword related to a service manual further supports the lure-based attack pattern.

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://baarspo.ru/wb?keyword=braun%20wheelchair%20lift%20service%20manual PDF link annotation
    • https://cdn.sqhk.co/gobajejuz/hciijhj/mejodivexazulupowibofi.pdfIn PDF document text
    • https://rusolozotiwar.weebly.com/uploads/1/3/5/9/135992237/rodomirutuzaruzujan.pdfIn PDF document text
    • https://jiwosanoxonu.weebly.com/uploads/1/3/5/2/135299962/1813423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_5fe9eee566ef3.pdfIn PDF document text
    • https://kilexudu.weebly.com/uploads/1/3/5/3/135347894/3743063.pdfIn PDF document text
    • https://vinawulisakuj.weebly.com/uploads/1/3/2/7/132712505/fadosedobikexi.pdfIn PDF document text
    • https://ganokupojedozo.weebly.com/uploads/1/3/4/8/134890080/24705305f.pdfIn PDF document text
    • https://fovojewonot.weebly.com/uploads/1/3/4/6/134669065/b89a574.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476930/normal_60012b1a64840.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459774/normal_5fffd1e66045e.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/gotijejaj/17233632158.pdfIn PDF document text
    • http://wigebinijeg.epizy.com/the_hollywood_reporter_oscar_roundtable_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/74052471621.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/billetera_movil_bolivia_apk.pdfIn PDF document text
    • http://solujenujaki.epizy.com/ffxiv_astrologian_job_guide.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_off0000bd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD61 5324 bytes
SHA-256: 0b8a5dcb3ecc1a716fbada58dac9302d19ddd31b135ac209ddf299575777decd
font_01_sfnt_off0000cf6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6D 10432 bytes
SHA-256: 2b869069346a5d8d1b78cbd03f719b97ad8c165694f330c98c9233d372624d39

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