Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc325ee38d6b1f50…

MALICIOUS

PDF

32.1 KB Created: 2020-05-13 01:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c8b91f2bf0898e48dadc995939a17b81 SHA-1: 19f9e2fe2bcdbcb07aeede123b9ad6d2c4b8a5a4 SHA-256: fc325ee38d6b1f50f8fb67bcb7795f36a170dff8357ac789472491a619eb8f8a
94 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external URLs, many of which also host PDF files. The document body text and embedded URLs suggest a lure to download further content, likely malicious. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the pattern of hosting a large number of external links.

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://the-whole-thing.com/uploads/1/3/0/6/130620521/130620521.html#11th+botany+textbook+pdf
    • http://naturetherapycic.com/uploads/1/3/0/6/130639052/77138a.pdf
    • http://thc-accessories.com/uploads/1/3/0/4/130435930/6478852.pdf
    • http://besttutorever.net/uploads/1/3/0/4/130488829/6090077.pdf
    • http://karafuutours.com/uploads/1/3/1/3/131380181/senotox.pdf
    • http://quicktan423.com/uploads/1/3/0/6/130639017/3d3a9a52656cb5.pdf
    • http://belginbal.com/uploads/1/3/0/2/130287984/koxag.pdf
    • http://ward-labs.com/uploads/1/3/0/7/130739652/95e9433a05d32.pdf
    • http://regattadeli.com/uploads/1/3/1/6/131606290/gizotifo.pdf
    • http://paragonsolutionsselect.com/uploads/1/3/0/6/130621461/rimosexepede.pdf
    • http://crnaccountancyconsultancy.com/uploads/1/3/1/3/131398104/4228384.pdf
    • http://totallypampered.net/uploads/1/3/0/5/130588543/61674ae9.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_off00005319.bin
f2e69dccd0468145d7f68570ca9c6123eb068e092f824eb22ef31fd7ad5d1ae3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5319 10076 bytes

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