Malicious PDF — malware analysis report

Static analysis result for SHA-256 3812d977d26338cb…

MALICIOUS

PDF

77.5 KB Created: 2021-03-23 02:56:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e90199e9966974b8d39bdf02018a6b3 SHA-1: 1f98f4324b14c182ffec957167e453120181441e SHA-256: 3812d977d26338cb6c6bb1809874b1540aedf5b523ae5dd6101c4374c142954d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on free web hosting services and appear to be part of a link farm. The document body, though heavily obfuscated, contains a search query related to 'open enrollment 2020 ny', suggesting a lure to trick users into clicking these links. The presence of ClamAV and ML heuristic firings strongly indicates malicious intent, likely for SEO spam or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://druttle.ru/wix?keyword=when+is+open+enrollment+2020+ny
    • https://vagafanuwojuxiv.weebly.com/uploads/1/3/0/7/130776749/2115495.pdf
    • https://fifurinirolegif.weebly.com/uploads/1/3/5/3/135306558/6c4f2a1266be9.pdf
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/00456cec.pdf
    • http://dilurijarejo.22web.org/32290012758.pdf
    • https://puzileto.weebly.com/uploads/1/3/4/6/134674509/zojabupamukuwa.pdf
    • http://gesaribenufemi.iblogger.org/kefixofutasozepivujopalu.pdf
    • https://cdn-cms.f-static.net/uploads/4455890/normal_5fdbb679e3cc5.pdf
    • http://amst-watch-v1.club/56717984182h5cuu.pdf
    • http://wuxudesif.22web.org/diccionario_castellano_italiano_en_linea.pdf
    • https://cdn-cms.f-static.net/uploads/4388283/normal_603a60fea5194.pdf
    • http://all-system7.xyz/kevovotwf4a.pdf
    • http://abzac.me/judevifowebinadi05duc.pdf
    • http://1xbet-registrat.site/686751558745b9cq.pdf
    • http://lg-copyrightforms.com/338180783152lza5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_96fb2c8fae4f4375851f497e6eee9984.pdf?index=true
    • http://fuvogixerad.epizy.com/answer_phone_incoming_calls.pdf
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_d9a962fb0aed4c9e9fedc9f2708db28e.pdf?index=true
    • http://jumerajoge.epizy.com/connectives_in_report_writing.pdf
    • http://wijinap.rf.gd/ismart_dv_app.pdf
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_6bebe879f6994b1f9abb3b8d0c5b747f.pdf?index=true
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_5febb9d108a647afb504ae900ea038b8.pdf?index=true
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc4.bin
d5635d4add8894941b6e96c564573fcadef92ac3d6d5bc19000e6195f0961a39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 5236 bytes
font_01_sfnt_off00010183.bin
455bafe51de578c36780371517eeb9f8afbb385952e583cd468c8d67bc4eb4ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 10912 bytes

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