Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13d39f3eba218d4…

MALICIOUS

PDF

41.6 KB Created: 2020-03-29 07:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f4c945e56fe069f835af6e3765ab7ffd SHA-1: f2640904dfce0cbdc94f98a813762143ea5fae99 SHA-256: a13d39f3eba218d40715df518780bab1fa26706e664630a0bfa1669876d5a247
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named PDFs, suggesting a link farm or SEO spam tactic. The document body, though partially corrupted, references a 'Sonicwall nsa 240 spec sheet', which is likely a lure to direct users to these external sites. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious intent.

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://misssoutheastpageantry.us/uploads/1/3/1/4/131410158/131410158.html#sonicwall+nsa+240+spec+sheet
    • http://www.lkaywatsonlpc.com/uploads/1/3/0/8/130874258/1428084.pdf
    • http://tnlectureship.org/uploads/1/3/0/8/130813643/sutaseligozejiroj.pdf
    • http://poolservicesfrisco.com/uploads/1/3/0/3/130323952/bexod-ledasimuxovo-pokerevifom.pdf
    • http://steamistparts.com/uploads/1/3/0/6/130640084/luzum.pdf
    • http://cubanmotion.com/uploads/1/3/1/0/131070009/safesozoxuse.pdf
    • http://sheriahernphotography.com/uploads/1/3/0/6/130604644/4172653.pdf
    • http://sipandshoptx.com/uploads/1/3/0/6/130639493/xubusolejoneje.pdf
    • http://www.clearlakelionshop.com/uploads/1/3/0/5/130550997/5911839.pdf
    • http://marymoorejazz.com/uploads/1/3/0/4/130435500/jopefalusoro-gajojogiw-fotunirixedis.pdf
    • http://leanadvocacy.org/uploads/1/3/0/6/130639928/3b6f90d3.pdf
    • http://adapt-life.com/uploads/1/3/0/8/130814043/8359981.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_off000064c5.bin
80e88fdc6335422a8a43f031882924ac3120bef091871dbf8c1828f137ef2957		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64C5 7748 bytes
font_01_sfnt_off00008301.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8301 16036 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.