Malicious PDF — malware analysis report

Static analysis result for SHA-256 740bedeb2fd36526…

MALICIOUS

PDF

131.3 KB Created: 2020-06-01 23:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af914de41fd62efca794a26620f4ca95 SHA-1: ed7475e86426fc6eae528e41704dec8a4c1ab6e7 SHA-256: 740bedeb2fd36526e8538238449577b7a96fbca425d7efa05937618ff20cfe9b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing indicating a link farm with 27 external PDF links, suggesting a malicious SEO or content distribution scheme. The embedded URL 'http://terapiaregresiva.org/uploads/1/3/0/7/130776220/130776220.html#streets+of+rogue+mods' and numerous other similar URLs point to a network of sites likely used to host further malicious content or phishing pages. The ML classifier strongly supports the malicious verdict.

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://terapiaregresiva.org/uploads/1/3/0/7/130776220/130776220.html#streets+of+rogue+mods
    • http://urrsula.org/uploads/1/3/0/2/130288397/d0262b03.pdf
    • http://howkins.com/uploads/1/3/0/6/130620251/dalefudawirilu.pdf
    • http://catanduanestravel.com/uploads/1/3/0/4/130491444/somejotubuwuk_fubutunetijagaz_siriwuxokar_jezarumu.pdf
    • http://discovermyrootstravel.voyagerwebsites.com/uploads/1/3/0/5/130550758/nisufefepuj.pdf
    • http://mail.ballouskies.com/uploads/1/3/0/6/130604806/xunazapejonarewebida.pdf
    • http://hostmaster.neshealthsolutions.com/uploads/1/3/0/4/130483862/wiwaxifutokirefuj.pdf
    • http://alphatotallandscaping.com/uploads/1/3/0/3/130379063/rotupenisiraso.pdf
    • http://localsonlychattanooga.com/uploads/1/3/0/2/130270836/riwuneri_surebitoxolav.pdf
    • http://coastalcateringfl.com/uploads/1/3/0/6/130604304/3988254.pdf
    • http://terapiaregresiva.org/uploads/1/3/0/7/130776220/terms.html
    • http://terapiaregresiva.org/uploads/1/3/0/7/130776220/dmca.html
    • http://terapiaregresiva.org/uploads/1/3/0/7/130776220/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://vagiseni.files.wordpress.com/2020/06/pibibugizof.pdf
    • https://gojinelidak.files.wordpress.com/2020/05/87554755654.pdf
    • https://wijekiril.files.wordpress.com/2020/05/jugopilizeni.pdf
    • https://zefafegepidi.files.wordpress.com/2020/05/15281731742.pdf
    • https://xuvisoje.files.wordpress.com/2020/06/motudituxemufuvogedemib.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cd18.bin
3ab3b7f17ed5425ce0f313b7af80d86a864eacdcdfb986d6adf158b71b7fe703
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD18 3696 bytes
font_01_sfnt_off0001da41.bin
9b00189d69805aed4304c278897316aada963f9a92ad9a9f40e610e88556311a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA41 11220 bytes