Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6bc20d3b282c845…

MALICIOUS

PDF

42.2 KB Created: 2020-03-30 12:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2efa8da611ec755edaac2972a4581fff SHA-1: 0a02811976fee8b5c9bf435556545585d97defd0 SHA-256: b6bc20d3b282c8459f80aee51b9610dad73553b827ee7b2764239bccdd5c1a5e
94 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier. It contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The document body text is largely unreadable, but the presence of numerous external links suggests a link farm or distribution mechanism for further malicious content. No scripts were extracted from this sample.

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://humannaturefoundation.com/uploads/1/3/0/6/130605010/130605010.html#teoria+de+sistemas+objetivos+y+estructuras
    • http://blakeleal.ca/uploads/1/3/0/5/130588942/9b0c00c9.pdf
    • http://enduremarket.com/uploads/1/3/0/7/130776099/wukuv.pdf
    • http://juandavid.com/uploads/1/3/0/7/130738950/jonafiwadifesop_vofenekifufes_lomumedifizulo_ropuk.pdf
    • http://mygrtbigftgreekstore.com/uploads/1/3/0/9/130969369/8ddc52.pdf
    • http://angelicharpacademy.com/uploads/1/3/0/7/130738644/jifuliwu.pdf
    • http://mail.cackc.org/uploads/1/3/0/7/130776067/xutorapisijidoxi.pdf
    • http://roadsideandtowing.com/uploads/1/3/0/2/130273761/8243554.pdf
    • http://406northvbclub.com/uploads/1/3/0/5/130551245/bekidegeme-momimetevekozuk-ronasovinemoni.pdf
    • http://nhc-ltd.com/uploads/1/3/0/5/130541641/a51eb98c54.pdf
    • http://buypolarxtracts.com/uploads/1/3/0/6/130621149/8ddc3bea4e.pdf
    • http://thefeedingteam.com/uploads/1/3/0/6/130604191/954889.pdf
    • http://coloredtreasures.com/uploads/1/3/0/5/130551091/3787c2823.pdf
    • http://aultmanforchanceryclerk.com/uploads/1/3/0/6/130604708/sigutasefi.pdf
    • http://ilfiloderbapsicomotricita.com/uploads/1/3/0/8/130814226/816731.pdf
    • http://afbrewco.com/uploads/1/3/1/4/131453325/894b60633a.pdf
    • http://socialgracecreative.com/uploads/1/3/0/9/130969037/pupumewajo.pdf
    • http://easyspisa.com/uploads/1/3/0/4/130488987/5440898.pdf
    • http://jameswilsterman.com/uploads/1/3/0/4/130490808/duxapote.pdf
    • http://katypoolservice.net/uploads/1/3/1/4/131437839/pukakajofo.pdf
    • http://rshealthandgifts.com/uploads/1/3/0/6/130604556/1155849.pdf
    • http://smartohana.com/uploads/1/3/0/6/130640097/2159483.pdf
    • http://brandywinevalleytrail.com/uploads/1/3/0/2/130273931/nisakurav.pdf
    • http://lananny.net/uploads/1/3/0/5/130539203/8738481.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_off00007b67.bin
d75629163358d5b7bed1c2ef61ff7c37664be9548cbb869800f97ac668fa825f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B67 8080 bytes

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