Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b234b6ca4239fd3…

MALICIOUS

PDF

33.5 KB Created: 2020-05-31 15:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fce7ff810687e66ac9568c73b9fd2303 SHA-1: b5c111beac19733918d9b6439ca1c061879fda5a SHA-256: 5b234b6ca4239fd39b71f044c96958513e62bacd119fee0e5b3e1ed48e734d01
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO spam tactic. The ML classifier strongly indicated maliciousness. The primary URL http://ufadducmatriz.org/uploads/1/3/0/5/130542982/130542982.html#labor+productivity+ratio is likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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://ufadducmatriz.org/uploads/1/3/0/5/130542982/130542982.html#labor+productivity+ratio
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://zeruzotel.files.wordpress.com/2020/05/88100560949.pdf
    • https://wiwabewata.files.wordpress.com/2020/05/97943406912.pdf
    • https://wurumopo.files.wordpress.com/2020/05/rekuwoluvixetokirikegu.pdf
    • https://rawexuma.files.wordpress.com/2020/05/ruzenuzofanukowoxesizen.pdf
    • https://fagirixol.files.wordpress.com/2020/05/54061711154.pdf
    • https://vasoponox.files.wordpress.com/2020/05/sigud.pdf
    • https://muvowovu.files.wordpress.com/2020/05/figukakubivepuw.pdf
    • https://kulowufobe.files.wordpress.com/2020/05/rorotijidaj.pdf
    • https://babupaxe.files.wordpress.com/2020/05/42750250993.pdf
    • https://jilumemew.files.wordpress.com/2020/05/11633065375.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057b0.bin
2b44a75ca1f76c23dd2a5f1c7a32be72bba57452b8f8fd8d16d6453a79242c4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57B0 10352 bytes

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