Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a881cd4ed7e455…

MALICIOUS

PDF

36.4 KB Created: 2020-04-07 14:40:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1cb8ba029ba523dff1fe00baad4cd348 SHA-1: 3b01bcd139dd6c93213b5a29edbfdcacf83680c8 SHA-256: 03a881cd4ed7e4552a77129dbf07f965eb2676c1ee6a4c26142a0e063fd2b1e9
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are structured as SEO-optimized URLs pointing to other PDF files. The document body, though partially obfuscated, includes a URL that appears to be a lure for a book title. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm, suggesting a campaign to drive traffic to potentially malicious or spam content.

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://prideonthepatio.com/uploads/1/3/0/5/130589240/130589240.html#mi+libro+magico+lectoescritura+nueva+edicion+pdf
    • http://palosverdesplumber.net/uploads/1/3/0/7/130738924/jivonunamaxuludariri.pdf
    • http://2liquidstore.com/uploads/1/3/0/6/130604823/panotide.pdf
    • http://sweetroot.net/uploads/1/3/1/4/131453248/nesinolimuxe.pdf
    • http://atlantismovingcompany.com/uploads/1/3/0/4/130493714/jemamigasizevanufuzi.pdf
    • http://apartamentosmudeseya.com/uploads/1/3/0/5/130539913/vojevezopamitutave.pdf
    • http://bowiepestcontrol.com/uploads/1/3/0/7/130776001/lerononuzeziga.pdf
    • http://smallsourcing.co/uploads/1/3/0/6/130620455/tozekebag_sepakemepeg.pdf
    • http://vitaebugs.com/uploads/1/3/1/1/131164417/b30b9e0.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062d8.bin
31989dec72d5ffcf6d38dd1d4adb81ffa2cacaa9dfcd65e34cb407255a500644		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D8 8980 bytes

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