Malicious PDF — malware analysis report

Static analysis result for SHA-256 d740884e1dff9e9a…

MALICIOUS

PDF

60.7 KB Created: 2020-04-10 20:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 175adabb4bc2816f314a33da4a1f72d0 SHA-1: cd663f7f1ac89f91fb9961844b9ed81407eb97dc SHA-256: d740884e1dff9e9a086070e235fc36c1b02cdda7ed554302394c94c8031f5018
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on unrelated domains. This pattern is indicative of SEO spam or a link farm designed to manipulate search engine rankings or redirect users to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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://roadshowarchitects.com/uploads/1/3/0/7/130740062/130740062.html#david+bowie+five+years+torrent
    • http://hireuswriters.com/uploads/1/3/0/4/130483142/wukewejovevonajuw.pdf
    • http://prismlabradors.com/uploads/1/3/1/4/131412858/wagiwedosemiked_nudebi_vigejaxexeloju.pdf
    • http://kidscars4less.com/uploads/1/3/0/7/130776850/5413235.pdf
    • http://pnpb.org/uploads/1/3/0/3/130323109/bedozaxepobija_kewuvevizopujav.pdf
    • http://djbadhabit.com/uploads/1/3/0/5/130540172/kuvejameb.pdf
    • http://theblindcartographer.com/uploads/1/3/0/6/130604859/kedom.pdf
    • http://jensfashionden.com/uploads/1/3/0/5/130589309/4397303.pdf
    • http://rightfit4u.net/uploads/1/3/0/6/130639698/muxoxowa.pdf
    • http://shibapuppies.us/uploads/1/3/0/7/130776041/piralebuk-bidupefojo.pdf
    • http://giveitbacktoseniors.org/uploads/1/3/0/2/130289214/fozada_tedatin_fexizi.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_off000095e8.bin
1e76928b5b275e3f76bdbb417077777bde94928c3fe461a3c20e42891bcbaf2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95E8 14660 bytes
font_01_sfnt_off0000c50c.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC50C 2616 bytes
font_02_sfnt_off0000ce40.bin
c6c28444bcd94379862b6cc7f8cfcdbcdaeb026857ccdb099d87626a561054a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE40 16092 bytes

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