Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2a14960080762d…

MALICIOUS

PDF

45.9 KB Created: 2020-06-13 20:39:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b69d0f7668eaf17f16c1d9682314e8e SHA-1: a853913cd4592c39e66f97c395cd8062146a625c SHA-256: 2c2a14960080762d553b414bfc2f9df6588cca1cb62ba4b8c5860a1923126f91
94 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to domains that appear to be part of a link farm designed to host malicious content. The document body, though heavily obfuscated, contains text related to a 'daily routine reading comprehension worksheet', suggesting a social engineering lure. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a large number of external links.

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://beltavolo.com/uploads/1/3/1/6/131636987/131636987.html#daily+routine+reading+comprehension+worksheet+pdf
    • http://en.bsbicycles.com/uploads/1/3/1/1/131164312/jogujibemijal.pdf
    • http://host9.celestecorp.com/uploads/1/3/1/4/131454482/joduwumelugi-vizir-rodus.pdf
    • http://johnpacewrites.com/uploads/1/3/2/3/132303335/siwezilog.pdf
    • http://jp.foreverinn.com.tw/uploads/1/3/0/2/130291551/c92e8d17cc.pdf
    • http://endkillerwhalecaptivity.com/uploads/1/3/0/6/130639824/2384004.pdf
    • http://switalia.com/uploads/1/3/0/9/130969572/16811b75a0bcd.pdf
    • http://authorpreneurworkshops.org/uploads/1/3/1/4/131452904/leseradakuta.pdf
    • http://mta-sts.mail.acroyogadresden.de/uploads/1/3/0/9/130969229/4647028.pdf
    • http://moonlightled.ca/uploads/1/3/0/2/130271030/bd61e8c3ec.pdf
    • http://box.hillmarfarm.com/uploads/1/3/0/3/130379397/sodefaguk.pdf
    • https://kudosemuzuna.files.wordpress.com/2020/06/ziwuragotufekuverubawokuz.pdf
    • https://nuvekutivuj.files.wordpress.com/2020/06/24380156823.pdf
    • https://xuvabogov.files.wordpress.com/2020/06/42823766000.pdf
    • https://dewotuf.files.wordpress.com/2020/06/filen.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_off00008855.bin
0eb301911d961584b9527e6d31a6fb9bddaf4c46b894df27f6b649c9f4315c27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8855 10392 bytes

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