Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bd29b6a2df88c08…

MALICIOUS

PDF

36.2 KB Created: 2020-06-06 07:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb38cbc4bce853629f621fe181b57c23 SHA-1: 729ce9f25cea0b11f69eb3773271df14556b8d42 SHA-256: 2bd29b6a2df88c08a170284bc5821f5cee0ae48e33a9780a7858c430ab20a50e
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to a network of linked websites, potentially for phishing or to serve further malicious content. No scripts were extracted, and the document body was heavily obfuscated, but the link farm is a strong indicator of malicious intent.

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://mta-sts.jtagaro.com/uploads/1/3/1/6/131637056/131637056.html#tkam+chapter+questions+and+answers+quizlet
    • http://webmail.pokrconsulting.com/uploads/1/3/0/8/130813325/1f474c33f16.pdf
    • http://screfrigeration.com/uploads/1/3/0/4/130435722/mefev.pdf
    • http://chevychaseinn.com/uploads/1/3/0/6/130620168/3711644.pdf
    • http://krisconstruct.com/uploads/1/3/0/7/130740183/497f3be64.pdf
    • http://texmexfrijoles.com/uploads/1/3/0/4/130435635/a516658cc9030.pdf
    • http://autodiscover.hoppinjohns.com/uploads/1/3/0/6/130604101/91c7b.pdf
    • http://kryanjenkins.shop/uploads/1/3/1/8/131857031/9738716.pdf
    • http://mobilenotaryinca.com/uploads/1/3/1/8/131871665/1593743.pdf
    • http://snap.town/uploads/1/3/0/2/130272905/dapadunedigi.pdf
    • http://messagefromralph.com/uploads/1/3/0/4/130477028/tatofovozufez.pdf
    • http://profranchisinginc.net/uploads/1/3/1/8/131871864/4370a7f5771da.pdf
    • http://mta-sts.jtagaro.com/uploads/1/3/1/6/131637056/terms.html
    • http://mta-sts.jtagaro.com/uploads/1/3/1/6/131637056/dmca.html
    • http://mta-sts.jtagaro.com/uploads/1/3/1/6/131637056/policy.html
    • https://bibulegil.files.wordpress.com/2020/06/sudenavox.pdf
    • https://suvapitegofe.files.wordpress.com/2020/06/gagabotef.pdf
    • https://jidibabeja.files.wordpress.com/2020/06/kolozosulevuzub.pdf
    • https://xumatarolawa.files.wordpress.com/2020/06/belolanarilonozenilotupa.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_off0000601f.bin
6b70d739bef55661f926187be3e48e7397bbc9921e355b089a8e7b9c6cfc44ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x601F 10896 bytes

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