Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81f892a22591657…

MALICIOUS

PDF

41.4 KB Created: 2020-04-21 04:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ec6c1453f71076dbd90af6d928b1b53b SHA-1: 13be4f8817c4304fc6494ae0321b4827463f622e SHA-256: d81f892a22591657d21bc191d01a18fd80366514d74707baf5fc5bfefc882704
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The document body, though partially corrupted, suggests a lure related to 'medical terms crossword puzzle answers'. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. 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://rhiannongower.com/uploads/1/3/0/5/130589000/130589000.html#medical+terms+crossword+puzzle+answers
    • http://lesentreprisesjdnl.com/uploads/1/3/0/6/130604766/4333020.pdf
    • http://sheenacaesar.com/uploads/1/3/0/6/130621530/0b6be567cf1ef.pdf
    • http://air2hair.online/uploads/1/3/1/4/131454024/8461560.pdf
    • http://spotonslgroup.com/uploads/1/3/1/4/131438876/927228.pdf
    • http://thesmartestdogintheworld.com/uploads/1/3/1/0/131070389/zosogipugukaxan_nunika_zolokubojef.pdf
    • http://splinteredmindprints.com/uploads/1/3/1/4/131438443/wutabarelak-bogufeje-kawaxesakun.pdf
    • http://2018michiganforecast.com/uploads/1/3/0/2/130272493/8042570.pdf
    • http://nowherenorthofficial.net/uploads/1/3/1/4/131453086/tefofar.pdf
    • http://hierground.com/uploads/1/3/0/3/130312913/vuvamib.pdf
    • http://rocknaturally.com/uploads/1/3/0/4/130476313/9842420.pdf
    • http://theatmman.net/uploads/1/3/0/8/130813373/sepajutidelaluzuj.pdf
    • http://resinasjapao.com/uploads/1/3/1/6/131636728/sudivasemapad.pdf
    • http://directelect.net/uploads/1/3/0/7/130776215/sajilo.pdf
    • http://mountaintopbrands.com/uploads/1/3/0/4/130488387/mowolatutudewi.pdf
    • http://belearningbebetterbethebest.com/uploads/1/3/0/7/130775219/xakavigo.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_off00007634.bin
78cf47d0181d7d8ce62a7d50c31c9cde12a169847e10989a4d6743898bebe3db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7634 8868 bytes

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