Malicious PDF — malware analysis report

Static analysis result for SHA-256 740344cba6c7e2c1…

MALICIOUS

PDF

40.4 KB Created: 2020-03-29 09:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4a2aabac304f4a03f8927e9dcda6ad8f SHA-1: 808d690a0e13b95356a350498b52adae0dedbb20 SHA-256: 740344cba6c7e2c12e96a6bb60e1880aef08bd4875d31091ce39b45cc400ea46
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. This pattern is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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://74-123-73-235.mgwnet.com/uploads/1/3/1/4/131438473/131438473.html#millas+por+hora+a+metros+por+segundos
    • http://andressalazar.com/uploads/1/3/0/4/130435629/sefema_devobesufobot.pdf
    • http://parkavenuevintage.com/uploads/1/3/0/7/130738482/zixaradisitolanore.pdf
    • http://abouttrees.info/uploads/1/3/0/7/130740000/dojozumadaxow.pdf
    • http://www.balance.ktgphd.com/uploads/1/3/0/5/130543488/bdd91871.pdf
    • http://bestbefrank.com/uploads/1/3/0/7/130776714/lagibexumaluvewes.pdf
    • http://onestoneworks.com/uploads/1/3/0/6/130604340/lobukazarixifuvi.pdf
    • http://bethanyclarephotography.com/uploads/1/3/0/6/130640040/juvolutemuwizokora.pdf
    • http://bidclues.com/uploads/1/3/0/7/130739237/renekuxevi.pdf
    • http://fairvotepiercecounty.org/uploads/1/3/0/3/130379314/6015958e6e7a.pdf
    • http://gordon4homes.ca/uploads/1/3/1/0/131069992/3341825.pdf
    • http://brusinagemmanutencaoesolda.com/uploads/1/3/0/4/130436139/ziwogiz-jowizopelu.pdf
    • http://lockoffclimbing.com/uploads/1/3/0/5/130546096/e582f95e.pdf
    • http://jacksonholeskipackages.net/uploads/1/3/0/2/130291689/pagamased-nonufexibuv-velazekoguduwof.pdf
    • http://zadarapartments.org/uploads/1/3/0/5/130544625/tabexatawaxeb.pdf
    • http://kadm7.fr/uploads/1/3/0/8/130814728/vigefadagojux_nuzidadogenojet_rifed.pdf
    • http://promotingteaching.com/uploads/1/3/0/7/130738871/0655294.pdf
    • http://bobbycriss.com/uploads/1/3/0/2/130289655/350690.pdf
    • http://mail.piscesenterprises.com/uploads/1/3/0/5/130551635/jadanoxegudu.pdf
    • http://topekapersonaltraining.com/uploads/1/3/1/0/131070846/vufix_tidaruxaw.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_off000075ff.bin
4f89bb396878a05defd3bc140a8d9c3d32a212ffe3bfd655000a0826027a4d6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x75FF 7516 bytes