Malicious PDF — malware analysis report

Static analysis result for SHA-256 4947a5128736d812…

MALICIOUS

PDF

52.9 KB Created: 2020-03-21 12:23:19 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2764441263561deb280b091a0799652e SHA-1: 7fbbd45651fdcd057b8fc67379d994783269c75e SHA-256: 4947a5128736d812decb364c1776df6eb2e9c9d2dafe532535706fa4aadc4bbd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document was flagged by an ML classifier with high confidence as malicious. It contains a large number of external links, characteristic of a link farm or SEO poisoning attack, designed to lure users to potentially malicious websites. The document body, though partially corrupted, contains references to URLs that are also present in the list of extracted URLs, reinforcing the 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://extravirgincoffee.com/uploads/1/3/0/6/130639285/130639285.html#ejercicios+resueltos+de+entalpia+de+formacion+estandar
    • http://jeffersonianconservatism.com/uploads/1/3/0/8/130874034/4160085.pdf
    • http://espoonkotipuutarhurit.fi/uploads/1/3/0/6/130605452/8575511.pdf
    • http://tusotolifestyle.com/uploads/1/3/0/6/130604748/4246803.pdf
    • http://mywendel.com/uploads/1/3/0/3/130313123/duwaperuje.pdf
    • http://amyandcraig.com/uploads/1/3/0/6/130620963/6730357.pdf
    • http://webmail.applicables.com/uploads/1/3/0/3/130323889/notejisopumeme-morinijom-molop-zokixax.pdf
    • http://www.edm-for-life.com/uploads/1/3/0/4/130475973/16db54320.pdf
    • http://septicpumpliftstations.com/uploads/1/3/0/6/130621944/586e97d3821a913.pdf
    • http://nomadicescaperoom.com/uploads/1/3/0/8/130874269/vipateguxemadodijemi.pdf
    • http://buyselllondon.com/uploads/1/3/0/8/130813840/1726197.pdf
    • http://koasports.com.au/uploads/1/3/0/6/130639369/c427aa78945.pdf
    • http://donyawicken.com/uploads/1/3/0/7/130776874/masexuletekamije.pdf
    • http://www.oleana.nl/uploads/1/3/0/9/130969472/85093fe05bd56.pdf
    • http://braziliansambadancersforhirenyc.com/uploads/1/3/0/6/130639557/4576580.pdf
    • http://northlondondrumlessons.co.uk/uploads/1/3/0/2/130273766/3c9d7c3eec.pdf
    • http://jgl-savingtime.org/uploads/1/3/0/8/130873758/8697005.pdf
    • http://tamesmusic.com/uploads/1/3/0/2/130291575/b44903f8cb37f1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008137.bin
f9916f4ed92f968aebbf3d48ff2d6b4eac277d22b5d7b0221d268f8cf62fbce9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8137 9620 bytes
font_01_sfnt_off0000a429.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea
pdf-font-stream PDF embedded font (sfnt) at offset 0xA429 2652 bytes
font_02_sfnt_off0000ad92.bin
a003c762be7583e1de981626f27d9201294a6d2a78716fcf79194663cb828d9d
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD92 16152 bytes