Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7afbe6762e1b961…

MALICIOUS

PDF

77.9 KB Created: 2020-03-17 22:40:38 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 11e152625f4e7d833d87d9f7fcdf6c37 SHA-1: e8414dff7f8e702578e9585200c68d65df65a297 SHA-256: d7afbe6762e1b961da5f17b5ede57feb7f4ca5272669114a33a9148a3239ddc8
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs, including http://escorti-milano.com/uploads/1/3/0/6/130604445/130604445.html#trabajo+final+conformado+de+materiales+upiicsa, suggesting a lure to external content. The primary attack pattern appears to be a link farm designed to manipulate search engine results or direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://escorti-milano.com/uploads/1/3/0/6/130604445/130604445.html#trabajo+final+conformado+de+materiales+upiicsa
    • http://buildonyourlandllc.net/uploads/1/3/0/8/130813658/8436085.pdf
    • http://wagner2003.com/uploads/1/3/0/5/130539678/7051059.pdf
    • http://iraqueer.org/uploads/1/3/0/3/130313035/waxaxozo_xijelaxuloxama_wifuruvalozev_daxoxuxusesif.pdf
    • http://tattoovictoriatexas.com/uploads/1/3/0/4/130489240/tezunizoze_nibineterobe_zetibenokejuxor_dujokimifib.pdf
    • http://www.planetstompers.org/uploads/1/3/0/6/130639643/fe40e0fad.pdf
    • http://mommyslittlewonders.com/uploads/1/3/0/6/130604069/2950288.pdf
    • http://dsn-122.com/uploads/1/3/0/7/130776649/joxugemadevukowurigi.pdf
    • http://eshadeshpande.com/uploads/1/3/0/6/130621918/9346136.pdf
    • http://www.drtrentonjohns.com/uploads/1/3/0/6/130621790/eb62efc1.pdf
    • http://www.mmacrashcourse.com/uploads/1/3/0/8/130874612/katagitaseze.pdf
    • http://molliemoptoppers.com/uploads/1/3/0/4/130476143/bikeboguwur_rotodoredow.pdf
    • http://brightleafadv.com/uploads/1/3/0/3/130379061/vurefafu.pdf
    • http://www.juneoros.com/uploads/1/3/0/5/130538869/lawiwifunuwi-ruturibejovemud-nasad.pdf
    • http://tp4seniors.ca/uploads/1/3/0/6/130621552/kejigeboxirefa_nixetagojomak_kafejoguwaxij_vozemi.pdf
    • http://www.mackprobuilding.com/uploads/1/3/1/0/131070309/149918.pdf
    • http://backyardgiantgames.com/uploads/1/3/0/7/130774964/faroruw.pdf
    • http://applyfordisabilitynow.us/uploads/1/3/0/3/130379137/6871035.pdf
    • http://pavechecks.com/uploads/1/3/0/4/130483299/4590889.pdf
    • http://maralynhargrove.com/uploads/1/3/0/6/130620173/rewajile.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dae7.bin
8645994567b67f16332bc7eb82ea324b1f73638b9171ae7a5ab9f24031028ebb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE7 1960 bytes
font_01_sfnt_off0000e3a7.bin
69195728f8977a16f4ab6e5a1c4ec3aa426f16c0b17384378d0c1d9ed7355c8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A7 10956 bytes
font_02_sfnt_off000109fc.bin
3d52fc27d04b8b84b219df719738f768697e09c2050136bc1fe69fcddf4eca6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109FC 2652 bytes
font_03_sfnt_off00011362.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11362 16036 bytes

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