Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bd96e32046ba6bc…

MALICIOUS

PDF

82.8 KB Created: 2020-03-21 12:26:33 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 11e405c0429953980f86623646db9a13 SHA-1: a6c507b539365a3fa6dca01e868eee0bab9c6fd9 SHA-256: 2bd96e32046ba6bcb793fd2579162581d2511c79608c92d4f4e5ed081e95e6ae
94 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier with high confidence. It contains a large number of external links, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates this is a deliberate attempt to create a link farm, likely for SEO manipulation or to distribute malicious content through a large number of seemingly innocuous links. No scripts were extracted from this sample.

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://marythumma.com/uploads/1/3/0/6/130620622/130620622.html#completeness+property+of+real+numbers+pdf
    • http://goodnewsdoctor.com/uploads/1/3/0/4/130488754/4164690.pdf
    • http://nic-hunter.com/uploads/1/3/0/6/130639578/3991919.pdf
    • http://modyjiller.com/uploads/1/3/0/4/130488429/tilevoziberoxuj.pdf
    • http://kassandracomplex.com/uploads/1/3/0/9/130969166/6411506.pdf
    • http://jayyxduggs.com/uploads/1/3/0/7/130739274/f91e78c4164c.pdf
    • http://thebigbigbucks.com/uploads/1/3/0/6/130639217/vinedewifaxavul.pdf
    • http://bearessentialnutrition.com/uploads/1/3/0/3/130313082/didatot_refavabodurafi_levekenaw_gaseremaker.pdf
    • http://turtlecayresort.devsite-1.com/uploads/1/3/0/8/130874514/pokavefuvil.pdf
    • http://www.livegentlewellness.com/uploads/1/3/0/6/130639235/a2d211.pdf
    • http://www.linlinkyawhtet.com/uploads/1/3/0/7/130776564/a22425.pdf
    • http://bhpromove.com/uploads/1/3/0/6/130621944/7cac3b9.pdf
    • http://stgeorgecountrydancing.com/uploads/1/3/0/2/130289722/liwawoso.pdf
    • http://sellsla.net/uploads/1/3/0/7/130775934/1329666.pdf
    • http://socialmediarehabilitation.com/uploads/1/3/0/5/130588315/8393539.pdf
    • http://craigbarrows.com/uploads/1/3/0/4/130476298/8561067.pdf
    • http://sauceis4ever.com/uploads/1/3/0/7/130739247/a78f64d3e294.pdf
    • http://www.bnppriskrfp-capgemini.com/uploads/1/3/0/7/130739430/8434172.pdf
    • http://phoeceessentials.com/uploads/1/3/0/7/130740461/7304184.pdf
    • http://gr.chromatropio.com/uploads/1/3/0/8/130873790/bonujidevufajizexinu.pdf
    • http://www.dianaewingart.com/uploads/1/3/0/5/130551021/vetitukulalutepanipo.pdf
    • http://www.bodyhealthwizard.club/uploads/1/3/0/7/130739533/defir.pdf
    • http://bnaiisraelnc.com/uploads/1/3/0/5/130539102/3e492e17.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010792.bin
763359eb459a3f8b831f4c8b73d99391fc5d92e74839a45bc98fa6beda83bdff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10792 12296 bytes
font_01_sfnt_off00013310.bin
1b6d79efc0fcb5a22b4d2556547293c2d7fa39233137737fd36d24085d27c0bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13310 2728 bytes

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