Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c3402079c551a6…

MALICIOUS

PDF

33.1 KB Created: 2020-06-03 23:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c926815c408709504a04be4ce6e542d3 SHA-1: 70a893cf1f73a77f4223ec0f6d9bb38d98d1e430 SHA-256: e3c3402079c551a61f45f74699696657e436306d03f7827642b2ab33df90d0b6
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm designed to manipulate search engine results or distribute further malicious content through the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://4f6.undesirable.us/uploads/1/3/1/6/131606132/131606132.html#daubeny+for+honor
    • http://windmountainsoaps.com/uploads/1/3/0/3/130379314/futix_laxuwot_runedapu.pdf
    • http://omfinance.org/uploads/1/3/1/3/131380591/b1061b.pdf
    • http://learnmoretype1.com/uploads/1/3/1/4/131409333/827498.pdf
    • http://thegoodlifebiblestudies.com/uploads/1/3/0/2/130288448/dijuronatomofibusar.pdf
    • http://lonestarrainwater.com/uploads/1/3/0/6/130603725/manewu.pdf
    • http://1kd.undesirable.us/uploads/1/3/0/2/130272327/3359513.pdf
    • http://verynicetruck.site/uploads/1/3/0/8/130813829/fda72466830a88.pdf
    • http://herxperience.org/uploads/1/3/0/9/130968917/lizugiwuvex.pdf
    • http://air8kiteboarding.com/uploads/1/3/1/8/131856200/fekanirowoxewo-pazidokiz-fozudobemaz-valenizur.pdf
    • http://4f6.undesirable.us/uploads/1/3/1/6/131606132/terms.html
    • http://4f6.undesirable.us/uploads/1/3/1/6/131606132/dmca.html
    • http://4f6.undesirable.us/uploads/1/3/1/6/131606132/policy.html
    • https://badumazu.files.wordpress.com/2020/06/fojozasivilotijevigipaja.pdf
    • https://lizomoriw.files.wordpress.com/2020/06/zojulomurenakibi.pdf
    • https://lagupok392153502.files.wordpress.com/2020/06/11349715037.pdf
    • https://pawelulewo.files.wordpress.com/2020/06/xumupalajomugijona.pdf
    • https://dipajar.files.wordpress.com/2020/06/75999806303.pdf
    • https://tapizoluzed454878337.files.wordpress.com/2020/06/3073431397.pdf
    • https://fimesijonoba.files.wordpress.com/2020/06/karimixezi.pdf
    • https://xalekivajev.files.wordpress.com/2020/06/dojesar.pdf
    • https://fupalowonega.files.wordpress.com/2020/06/lusesewazamebijodo.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056db.bin
233f4a467054d59b22d2e463eacecd5d3379e91c1e0f55a0da9f03d43ed2c64e
pdf-font-stream PDF embedded font (sfnt) at offset 0x56DB 10096 bytes