Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d63e7137e30661…

MALICIOUS

PDF

34.5 KB Created: 2020-06-11 19:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 9cc4737e9433fed94b6fad05a6759db2 SHA-1: 305d6e3bc4c34d22fa67457362483fc4ff5292a8 SHA-256: 97d63e7137e30661b8c98ae539161dd4cc43507021ca47361f1723275e76176f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of SEO poisoning or a link farm designed to distribute malicious content or redirect users to phishing sites. The ML classifier strongly supports the malicious verdict. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://78.undesirable.us/uploads/1/3/0/7/130738812/130738812.html#roman+s301+manual PDF link annotation
    • http://erniebauer.com/uploads/1/3/0/3/130379696/wilajobasifelejeb.pdfIn PDF document text
    • http://superiorinspectionsdfw.com/uploads/1/3/0/5/130590138/3458369.pdfIn PDF document text
    • http://fitluv.net/uploads/1/3/1/3/131383826/solifenev-burajo-pixurepajejuwa-bikasefaz.pdfIn PDF document text
    • http://ctscapitoltransportservicesllc.com/uploads/1/3/0/2/130272928/gakaletelu.pdfIn PDF document text
    • http://rnbandhiphopradio.com/uploads/1/3/0/8/130813781/safexijag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zaloguko.files.wordpress.com/2020/06/kopawusaviwonokebaz.pdfIn PDF document text
    • https://semigumita.files.wordpress.com/2020/06/24268688680.pdfIn PDF document text
    • https://zovokage.files.wordpress.com/2020/06/zakibujitorifetusin.pdfIn PDF document text
    • https://mudopepomof.files.wordpress.com/2020/06/45175960384.pdfIn PDF document text
    • https://xifabufuvari.files.wordpress.com/2020/06/70523282328.pdfIn PDF document text
    • https://rujanowo.files.wordpress.com/2020/06/fojosukatorimujobupeke.pdfIn PDF document text
    • https://ridedude.files.wordpress.com/2020/06/desiwuw.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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55C9 13036 bytes
SHA-256: 3f4c42b8a3553212f65541734cce4ab403650573f4222d01402c0af79769ceb6

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