Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ac613f204e4da1…

MALICIOUS

PDF

37.5 KB Created: 2020-04-22 07:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e425aa41b477a91af54a246d62cf88ce SHA-1: 9268f02a079bc116f302d9a168701d6a7a17b9a0 SHA-256: 21ac613f204e4da1c3cee7f485b8ad3c834a7f6d52cca60db0d8ce58ff608a1d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by an ML classifier as malicious and contains a large number of external links, indicative of a link farm or SEO spamming technique. The primary purpose appears to be to distribute traffic to numerous unrelated domains, potentially for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://esperanzamassagetherapy.com/uploads/1/3/1/4/131406077/131406077.html#musicas+ballet+classico
    • http://affglomedical.com/uploads/1/3/1/3/131384044/bodog.pdf
    • http://opalmccarthy.com/uploads/1/3/1/4/131437335/wezisorogodu.pdf
    • http://seanstrong.net/uploads/1/3/0/3/130323211/2073223.pdf
    • http://swearingenbats.com/uploads/1/3/0/4/130436313/cc5ec9a08255a.pdf
    • http://jeanstandmeministries.com/uploads/1/3/0/6/130605355/xemomugexufodep.pdf
    • http://practicalguys.com/uploads/1/3/0/6/130603994/5515924.pdf
    • http://lifewithoutlimits-utk.org/uploads/1/3/0/8/130813111/dekomesonov.pdf
    • http://dinnerfitbox.com/uploads/1/3/0/2/130287413/sopiteno_kivojujofuzon_puzabowovo_gunitaxomaka.pdf
    • http://drivewithcoin.com/uploads/1/3/0/4/130476317/5729776.pdf
    • http://viningssquare.com/uploads/1/3/0/8/130814851/11c33a9.pdf
    • http://policymakers.org/uploads/1/3/0/8/130814229/jetemegajowol_fejutizej_visuneralenedu.pdf
    • http://onyxandoak.net/uploads/1/3/0/2/130271097/nafosaje.pdf
    • http://themikefrazier.com/uploads/1/3/0/8/130874521/guwunuvemog.pdf
    • http://veneziamilano.com/uploads/1/3/1/4/131453713/628439.pdf
    • http://lvgeneralservices.com/uploads/1/3/1/3/131383204/muvisumotozodinosa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000548d.bin
a3ed76f1cbb270f7de7487d83c3ca2a10ce7a9da390de06ea6b47f71e4d3b25c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x548D 9156 bytes
font_01_sfnt_off0000733d.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x733D 16036 bytes

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