Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b93f3af6170f65b…

MALICIOUS

PDF

37.7 KB Created: 2020-03-22 14:08:59 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f6625c2fb49c10b77229325929c8fcd6 SHA-1: 0a21287dd1405199bb96fc6d0e4129119593458f SHA-256: 6b93f3af6170f65bb2b7943f2eda9bb1e023e89cdb0dbd194e3e624575db6b86
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness. The embedded URLs are likely used to distribute further malicious content or for SEO spam.

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://adcapartments.com/uploads/1/3/0/2/130270974/130270974.html#all+of+me+uke+chords+jazz
    • http://estudionudo.com/uploads/1/3/0/6/130639114/lesizu.pdf
    • http://spillthetea.info/uploads/1/3/0/8/130874535/b5501.pdf
    • http://timmersdesignanddrafting.com/uploads/1/3/0/6/130604180/4796829.pdf
    • http://sellingdalton.com/uploads/1/3/0/6/130605347/kuxowexefetikigabez.pdf
    • http://www.selenialimited.com/uploads/1/3/0/3/130323556/d8d8334921.pdf
    • http://stopsenselessviolence.com/uploads/1/3/0/7/130775510/vodugegi_bebizesizowuwu.pdf
    • http://kimberlyallston.com/uploads/1/3/0/8/130814168/lejakoxijiduk.pdf
    • http://carbonneutralnetwork.org/uploads/1/3/0/4/130476294/98a8939fa6f.pdf
    • http://wehelpusa.com/uploads/1/3/0/9/130969595/kazarawexaxulova.pdf
    • http://housechampionsllc.biz/uploads/1/3/0/8/130874146/muluturab.pdf
    • http://clerihews.com/uploads/1/3/0/6/130639117/606242.pdf
    • http://deltapsidelta.ca/uploads/1/3/0/8/130874614/978b204.pdf
    • http://jsl-inc.com/uploads/1/3/0/5/130543020/mirexilalipib-todifixa.pdf
    • http://musicmastertraining.com/uploads/1/3/0/8/130814070/5109103.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_off00006827.bin
6002177cd1d44f56d909ed66672d8da72845189486803dc57c1f5f736382c2f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6827 8648 bytes

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