Malicious PDF — malware analysis report

Static analysis result for SHA-256 0951a0bd35156770…

MALICIOUS

PDF

41.6 KB Created: 2020-06-19 05:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e19395ee5b21543c243d60bc95a4f56 SHA-1: 351130a7911912129160923849e016db981dbbc8 SHA-256: 0951a0bd351567708f5c1f84b45d810172576849b662a173d219bac8cab40a51
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, identified as a link farm, designed to redirect users to external sites. The document body, though partially obfuscated, suggests a lure related to 'Epa air pollution control cost manual', indicating a potential phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, 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://1hs.undesirable.us/uploads/1/3/0/2/130270882/130270882.html#epa+air+pollution+control+cost+manual
    • http://ns1.stuartsnyder.net/uploads/1/3/1/8/131856402/viwijas.pdf
    • http://thelifeswitch.com/uploads/1/3/0/3/130323635/979332.pdf
    • http://cpanel.aaiinspectionsllc.com/uploads/1/3/1/4/131452947/a3f185b.pdf
    • http://xn--premoldeadosalbiana-b4b.com/uploads/1/3/0/6/130603971/b2a9a3ea413e.pdf
    • http://mta-sts.cahayatimur.net/uploads/1/3/0/4/130436079/391769.pdf
    • http://mx.grimsin.com/uploads/1/3/0/7/130740092/4267399.pdf
    • http://dunkhilldrygoods.com/uploads/1/3/0/4/130476587/2987806.pdf
    • http://tandb.net/uploads/1/3/0/5/130588856/tajasabuwosomav.pdf
    • http://tierraburns.com/uploads/1/3/0/7/130739786/sasadu_mibamutoze_dunodusususinu.pdf
    • http://webmail.banana-asia.com/uploads/1/3/1/4/131406784/fuxojetiniv_zabexexise.pdf
    • http://webdisk.harnhamfreechurch.org/uploads/1/3/0/7/130740158/moxene.pdf
    • http://tillyoil.online/uploads/1/2/8/7/128777173/128777173.html?html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006628.bin
215ea38d1f64343391035762c59908b282e26afe05835163626f2e2031855a9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6628 4800 bytes
font_01_sfnt_off0000764b.bin
9c293ff87560328fb908cc3a1e4717343a0ab1da0e14cf01da55b6b0b1d5a86b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x764B 10480 bytes

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