Malicious PDF — malware analysis report

Static analysis result for SHA-256 632bb28ca764ca5c…

MALICIOUS

PDF

39.8 KB Created: 2020-03-12 06:25:26 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: da552d9b6917c446d19084f827d10a61 SHA-1: 9b061af3a8bcbf594ac4f66e7caabd4c93e47d91 SHA-256: 632bb28ca764ca5c6c2ddcd7f2ea98a11e826c6151d7a2d0e796519ee7e41a4c
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and numerous external links suggest an attempt to redirect the user to potentially malicious content or to manipulate search engine rankings.

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://mmhac.com/uploads/1/3/0/5/130542860/130542860.html#cartesian+unit+vectors+in+terms+of+polar+coordinates
    • http://ablehorsewomanship.com/uploads/1/3/0/7/130776079/xujigov.pdf
    • http://whitefe.skipcoryell.com/uploads/1/3/0/8/130873801/7e67d688dcb1.pdf
    • http://no-sauce.nl/uploads/1/3/0/6/130621853/5557321.pdf
    • http://comunidadcapital.com/uploads/1/3/0/5/130544131/zawozopupuvoj_pofow_mifetipog.pdf
    • http://holypostdigital.com/uploads/1/3/0/7/130739265/filaberamadilumagaw.pdf
    • http://myfitnesssolution.com/uploads/1/3/0/2/130274338/df11d7ef557d7.pdf
    • http://www.equisociety.net/uploads/1/3/0/4/130477633/sozugenevobe_sajuxivizaluga_milivixiwuxib.pdf
    • http://mytxreal.net/uploads/1/3/0/7/130776316/6605285.pdf
    • http://nowphotobooths.com/uploads/1/3/0/4/130488114/papelufu-sonibono-zosojusugolini-wezan.pdf
    • http://goodtogodiets.com/uploads/1/3/0/5/130546519/4330786.pdf
    • http://kristibowdenphotography.com/uploads/1/3/0/2/130272940/kivatatunu.pdf
    • http://rivertonselfstorage.com/uploads/1/3/0/7/130738875/dimalaze.pdf
    • http://emergencyimplants.com/uploads/1/3/0/4/130488834/f0b8c5e381.pdf
    • http://cuidare.net/uploads/1/3/0/5/130543038/e573493f0d541a.pdf
    • http://simpletravelin.com/uploads/1/3/0/9/130969505/putijuvumus-jomigepelu-wutokutege-dazirera.pdf
    • http://iamjeffsmith.com/uploads/1/3/0/5/130588286/2354697.pdf
    • http://webmail.accentdrapery.com/uploads/1/3/0/4/130435685/ad1711ec21.pdf
    • http://nourishedwombyn.com/uploads/1/3/0/6/130621279/sijubiwido.pdf
    • http://myanalogworld.com/uploads/1/3/0/7/130739628/9012058.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_off00007330.bin
37cb391c900babd5de7f565f95754ff91740f92a2ef1c8248464cc9b58db4591
pdf-font-stream PDF embedded font (sfnt) at offset 0x7330 7732 bytes