Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8992a0cf025b234…

MALICIOUS

PDF

79.2 KB Created: 2020-03-30 08:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 974a5f53c4ffd069bfe2a493a43dc129 SHA-1: b972af12a372e7fa055332b778ae0304de722ac7 SHA-256: d8992a0cf025b234fa669b9425e292bd8281accb7cc6473fe0076b327bdba45d
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are dynamically generated and point to unrelated domains. The document body, though partially corrupted, suggests a lure related to a mathematical formula. The heuristic 'PDF_SEO_LINK_FARM' indicates a technique commonly used to inflate search engine rankings or distribute malicious content across many compromised sites. The ML classifier strongly flags this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 3

  • 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
  • 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://trentriverdesigns.com/uploads/1/3/0/7/130738559/130738559.html#formula+para+circunferencia+de+circulo
    • http://bidwelloptometry.net/uploads/1/3/0/8/130874025/pevofebolisomut_zuvemoj_lokezosuwe.pdf
    • http://prakrutigroups.com/uploads/1/3/0/5/130590622/9e1c806ee3.pdf
    • http://happyhomehelper.com/uploads/1/3/0/7/130740477/zebozupag_jevamabitituro_zegulotun.pdf
    • http://anxietydepressionbreakthrough.com/uploads/1/3/0/4/130435813/7f7e93b.pdf
    • http://ptamarymunfordelementaryschool.com/uploads/1/3/0/5/130544968/7f37202c63a.pdf
    • http://slatteneyecare.com/uploads/1/3/0/8/130813489/8559812.pdf
    • http://bobodigitalmarketing.com/uploads/1/3/0/2/130271058/doruwedilari-sadizoguwaxe-nomijanivaz.pdf
    • http://hvacmarketingexpertteam.com/uploads/1/3/0/8/130814868/8d7ddf.pdf
    • http://utopiamind.com/uploads/1/3/0/6/130621383/nadevi.pdf
    • http://cleaners-barn.com/uploads/1/3/0/2/130289475/fa53380.pdf
    • http://southernstylelawncarenc.com/uploads/1/3/0/8/130873740/8848931.pdf
    • http://amocpro.com/uploads/1/3/0/7/130776324/674b3857e1b.pdf
    • http://delaneybuyshouses.com/uploads/1/3/0/8/130874212/69906c6f.pdf
    • http://applepickndays.com/uploads/1/3/0/7/130775375/zilekazoxubil.pdf
    • http://diamondsmaidshomecleaning.com/uploads/1/3/1/1/131164447/4307850.pdf
    • http://kellyslay.com/uploads/1/3/0/3/130313271/189146.pdf
    • http://chatthillscommunity.com/uploads/1/3/0/7/130740464/fodifejefu.pdf
    • http://midnightepiphanymusic.net/uploads/1/3/0/7/130776239/8886690.pdf
    • http://newenglandsmartenergyllc.com/uploads/1/3/0/7/130738837/noxeg-zovukukog-vesuvi.pdf
    • http://maschasprints.studio/uploads/1/3/0/6/130604758/puxaregifu.pdf
    • http://giftacademyinc.com/uploads/1/3/0/5/130550782/mitutili.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000089a1.bin
b676066d98a822406d22a1519f8af0416cbd12cc4a161f691a51eb3e1b1c5638		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89A1 12888 bytes
font_01_sfnt_off0000a721.bin
27b0133fb901c872b1e0c1c181f7b2de6d971de2c51b898412bb417f410d40f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA721 13788 bytes
font_02_sfnt_off0000d116.bin
985cbd9ba5b629f1b749d04d852c0eecb5d8ad374186a1044a60da9476420dc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD116 2788 bytes
font_03_sfnt_off0000daba.bin
39b3e25e6c11680a4d2ef9cce88153780f640721e6c661d7a5cf789cb5b5a769		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 9156 bytes
font_04_sfnt_off0000f880.bin
5ccfae50182e9f90bdc7b2c44ca6c54d79a98fce763c9af8944d60b8161596c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF880 18260 bytes
font_05_sfnt_off000114fd.bin
01aa368a95451d47e2b6b131f13c54a4e6d29fd418df51930a604e2dd188182a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114FD 8320 bytes

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