Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f111985a932b52…

MALICIOUS

PDF

33.2 KB Created: 2020-06-01 10:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 7aa06617cf9ada99de79ff1622862c9f SHA-1: f8c8f91a0a7e807cf0a8d378ed6a4cfb35a900a3 SHA-256: 86f111985a932b52c58796c449d6915e1f1189a53a43ff47dd8996dc2f541b7d
96 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to potentially malicious content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allstarcreditrepair.com/uploads/1/3/0/7/130774965/130774965.html#free+model+boat+plans+balsa+wood PDF link annotation
    • http://theaustraliancraftdrinkscompany.net/uploads/1/3/0/5/130588318/sobomipapopamux.pdfIn PDF document text
    • http://lifespanus.com/uploads/1/3/1/4/131406606/3439356.pdfIn PDF document text
    • http://think-differently.eu/uploads/1/3/0/3/130313188/3271131.pdfIn PDF document text
    • http://highlandparkbaptistchurch.net/uploads/1/3/0/6/130604973/bejexabilosa_pitakererined_mitokadur_zawowolovekazex.pdfIn PDF document text
    • http://stemgolf.com/uploads/1/3/0/4/130488935/jixevijiwox_gabide_tirafosexaf_wogenumukivavo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dugazide.files.wordpress.com/2020/05/64626482145.pdfIn PDF document text
    • https://poxatesorev.files.wordpress.com/2020/05/74271305126.pdfIn PDF document text
    • https://zokuvadezod.files.wordpress.com/2020/05/16274636103.pdfIn PDF document text
    • https://mameloga.files.wordpress.com/2020/05/18706744401.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56FE 10144 bytes
SHA-256: dcbc7ce622b853bde32bdabf58cd866e560c9ac59d9bd2ec569d6789715886eb