Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6bf104db2657b2…

MALICIOUS

PDF

76.4 KB Created: 2020-04-12 07:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b1d00026ae09f5584edccb46fb5feda3 SHA-1: d285968e55bf015f3479a92475407548768a1241 SHA-256: 6b6bf104db2657b24072bf8b516b377bd9b43270ad70486f4de513e8b7b7bb2d
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, directing users to various websites. The document body, though partially corrupted, contains text related to 'Influenza' and mentions the authoring application 'wkhtmltopdf', suggesting a deceptive lure. The ML classifier strongly indicated maliciousness, and the presence of many external URIs points towards a phishing or SEO spam campaign.

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://pinnaclelightinganddesign.com/uploads/1/3/1/0/131070366/131070366.html#influenza+esquema+historia+natural+de+la+enfermedad+influenza
    • http://pokeplayerhq.com/uploads/1/3/0/5/130546209/7332356.pdf
    • http://prettyyummydiy.com/uploads/1/3/0/7/130739718/negelofopaleb.pdf
    • http://macscanteen.com/uploads/1/3/0/5/130544086/5039161.pdf
    • http://ergomobile.ca/uploads/1/3/1/3/131379877/gutitozid.pdf
    • http://peristorm.com/uploads/1/3/1/3/131380777/bozidasovonomisog.pdf
    • http://lvserenitycarellc.com/uploads/1/3/0/5/130589264/9629807.pdf
    • http://buildonyourlandllc.net/uploads/1/3/0/5/130588497/09e17a801.pdf
    • http://jewelryappraiser.us/uploads/1/3/0/6/130605358/7171bc11013.pdf
    • http://vehicle32846466475.com/uploads/1/3/0/7/130739200/5977382.pdf
    • http://bentleybuilders.org/uploads/1/3/0/9/130968942/tobisodomumodibatu.pdf
    • http://royalanimals.com/uploads/1/3/1/4/131409167/wufurupixigewomuji.pdf
    • http://brettsimper.com/uploads/1/3/0/5/130551749/fupopukegelaligozi.pdf
    • http://www.muktub.com.au/uploads/1/3/0/8/130814421/zesawajaliw-juriku.pdf
    • http://deenakrishna.com/uploads/1/3/1/4/131437181/besefag.pdf
    • http://myfiltershop.com/uploads/1/3/0/5/130551342/222db2148ea3.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db42.bin
58badb97f376d4393d8084f6ae1468ba371d5f51fac9482e2e1714111f476785
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB42 2080 bytes
font_01_sfnt_off0000e498.bin
f69be978d15d9cf27f7b27183e6e930e53e3193ea28bfae9360e3f2a52d2221c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE498 11952 bytes
font_02_sfnt_off00010d4f.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4F 16036 bytes