Malicious PDF — malware analysis report

Static analysis result for SHA-256 78931c09767cf90a…

MALICIOUS

PDF

42.6 KB Created: 2020-04-01 15:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b498e3f144ee74f35bc57ce50c785383 SHA-1: 73c39dad4bcd9b01c328a7916efeed624c077c4c SHA-256: 78931c09767cf90a0c20f0ce5f298a95ab18b04afadcd501e5ca287fe6c7a373
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic. These links point to various domains, suggesting a link farm or a distribution mechanism for further malicious content. The ML classifier also strongly indicated maliciousness. The document body itself contains garbled text and some of the extracted URLs, reinforcing the link farm observation.

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://northwestuu.com/uploads/1/3/0/6/130604020/130604020.html#adjetivos+calificativos+definicion+y+ejemplos
    • http://littlehouseonthegrid.net/uploads/1/3/0/2/130289632/matifipodesi-gavekakuje-sofaponebipunir.pdf
    • http://irwinbgalino.com/uploads/1/3/0/2/130287898/dcb710083.pdf
    • http://aaaphysiotherapy.com/uploads/1/3/0/9/130969678/liwifex.pdf
    • http://mendocinorose.com/uploads/1/3/1/4/131438538/tevexavidimunugunege.pdf
    • http://airwaycore.com/uploads/1/3/0/6/130604126/3941115.pdf
    • http://coliverelectrical.com/uploads/1/3/0/8/130874253/3091823.pdf
    • http://studioalphabrescia.com/uploads/1/3/0/4/130476079/gowapexugezu.pdf
    • http://rstrucking.org/uploads/1/3/0/2/130274076/jugolabuvimoju.pdf
    • http://pitneystudios.com/uploads/1/3/0/4/130435520/9710920.pdf
    • http://mtmotorboatin.com/uploads/1/3/0/6/130639362/rigozenavaz.pdf
    • http://rainbowsunbeams.org/uploads/1/3/0/7/130739532/xobexugotubojedalevi.pdf
    • http://memoryicons.org/uploads/1/3/0/7/130738759/582b5.pdf
    • http://samanthasruba.com/uploads/1/3/0/7/130775085/vexikepojuku.pdf
    • http://muyujun.com/uploads/1/3/0/4/130483394/f6ed5e5b.pdf
    • http://sunpulsesolar.org/uploads/1/3/0/8/130813991/panen_zezatajoxilepil_sakifi_pesagif.pdf
    • http://laserfotoworx.com/uploads/1/3/0/7/130739536/4ab4d1c72d5ee5.pdf
    • http://1650lakecook.com/uploads/1/3/0/6/130604678/wuguxu-rimek.pdf
    • http://projectblkbird.com/uploads/1/3/0/9/130969316/2516557.pdf
    • http://saritaa54.com/uploads/1/3/0/7/130775456/biketole.pdf
    • http://sonofgodworkshop.com/uploads/1/3/0/9/130969926/lefurejulufe_ralibemufuvaneb_jaralatuw.pdf
    • http://cpv.services/uploads/1/3/0/4/130488839/sigogove.pdf
    • http://kindheartscoll.com/uploads/1/3/0/6/130603861/tulubitupulufuziwino.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000734d.bin
1643e6bfb30d6a5143bda83cf6652a50fca2892cf261e530fbad21ac83f38ff2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x734D 8184 bytes
font_01_sfnt_off000090ed.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90ED 2652 bytes

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