Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c73c89e70561183…

MALICIOUS

PDF

39.2 KB Created: 2020-03-29 21:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5269e8c47059aeb0a4cd56a1c11889cf SHA-1: ed45cc68710d547a7a6433020c543be52abda6e4 SHA-256: 0c73c89e705611830abafd5d9992e86820596d83f39bf2bc5b9f8b66b2c45861
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of external links, identified as a PDF link farm. The document body, though partially corrupted, contains references to educational materials and the wkhtmltopdf application. The primary function appears to be directing users to a vast collection of external PDF documents, likely for SEO spam or to host malicious content.

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://bodyworkbybarb.com/uploads/1/3/1/4/131454116/131454116.html#evaluacion+lengua+4+primaria+santillana+saber+hacer
    • http://dumpbodiesinc.com/uploads/1/3/0/7/130739559/gorulonujo_fisowow_lepukalezu_lakikaxixavi.pdf
    • http://oreade.ch/uploads/1/3/0/8/130814553/1c4bbc7.pdf
    • http://qtcosmetics.com/uploads/1/3/0/5/130551257/nejepepexilisis_kirujaj_piwukimudazujep.pdf
    • http://trainthewaywework.com/uploads/1/3/0/9/130969985/tawaxakuriko_vusapokabajik_genar_luwasokagamu.pdf
    • http://sallycasey.com/uploads/1/3/0/8/130874053/152d7b66f.pdf
    • http://elliottwheelerthelongtimepreview.com/uploads/1/3/1/3/131378993/8859780.pdf
    • http://neobedbugtaskforce.com/uploads/1/3/0/4/130435690/kemogesisituke_lizafa_ziwumo.pdf
    • http://lesviviersdelocker.com/uploads/1/3/0/5/130540559/jenajixipika_jinogija_gilogeruz_pipuf.pdf
    • http://nicegiftsandhomewares.com/uploads/1/3/0/2/130273893/nejoji-kapoj.pdf
    • http://fbbcmadisonmembers.com/uploads/1/3/0/6/130620309/8313447.pdf
    • http://oliviaiannotti.com/uploads/1/3/0/6/130639461/didadufepod_nupuki_poxuzupufu.pdf
    • http://whiterockmedical.com/uploads/1/3/0/4/130488846/fovinor-govuza-loviwexoregukum-nages.pdf
    • http://green-elephant-trading.com/uploads/1/3/0/5/130550911/965e2cf0074c410.pdf
    • http://wrigg.org/uploads/1/3/0/2/130273791/9559073.pdf
    • http://airlieecoartfest.com/uploads/1/3/0/5/130546294/burokalepetaz-kavuluz-nakagipivusixo-fadubaletipima.pdf
    • http://hairstyliste.nl/uploads/1/3/0/9/130969294/fakofuz_bemepekokoneda_zubujinuson.pdf
    • http://dandelmonte.org/uploads/1/3/0/9/130969231/6260178.pdf
    • http://minimumtread.com/uploads/1/3/0/9/130969343/805c365ae09.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_off00007022.bin
44e693a82b0bb0b798186d413cee9b56778759d720c31f1865e69f1a4f3cf1f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7022 7972 bytes

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