Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8292817c0cb4296…

MALICIOUS

PDF

75.1 KB Created: 2021-03-24 09:16:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08fa650fbd0ef23dc279cde3bf0ba487 SHA-1: ba3461e204d2336bfe7fa0f5af52ea8ecb956525 SHA-256: b8292817c0cb4296a94fbde1142b4f6a52daf4826f70a3299b8dcb5272ff6458
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated or appear to be part of a link farm, indicating a phishing or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to a malicious site or download further payloads. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://soxebez.ru/wix?keyword=unit+4+vocab+ap+us+history
    • https://cdn-cms.f-static.net/uploads/4488604/normal_60191a9790cb5.pdf
    • https://cdn-cms.f-static.net/uploads/4496828/normal_5fe6c9f50ad62.pdf
    • https://static.s123-cdn-static.com/uploads/4374979/normal_6001eacb4c43d.pdf
    • https://static.s123-cdn-static.com/uploads/4371010/normal_5fca704d2fe32.pdf
    • https://static.s123-cdn-static.com/uploads/4465387/normal_5fcfb03b685d8.pdf
    • http://getubij.66ghz.com/tuberculous_lymphadenitis.pdf
    • https://static.s123-cdn-static.com/uploads/4478146/normal_5fca853c3db8a.pdf
    • https://cdn-cms.f-static.net/uploads/4390366/normal_600acb9248264.pdf
    • https://cdn-cms.f-static.net/uploads/4406208/normal_5fe7941650c8c.pdf
    • https://cdn-cms.f-static.net/uploads/4366042/normal_6021a8ea02c93.pdf
    • https://cdn-cms.f-static.net/uploads/4497109/normal_604cb891858f4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_a3e15c88aaf04efeb525bff9a7cc6589.pdf?index=true
    • https://s3.amazonaws.com/geradi/kitodepiforuzow.pdf
    • http://neveket.epizy.com/tozusafobebilorupasemo.pdf
    • http://nifekubipaxo.epizy.com/bavewotiwozuwu.pdf
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_f421e08894654c719a9ce54120437179.pdf?index=true
    • https://1580f21e-fc75-4350-9669-3be8b7525729.filesusr.com/ugd/eff6cf_95277142646f4121a788ddc43ece796a.pdf?index=true
    • https://s3.amazonaws.com/nefomojuwet/2003_jeep_liberty_parts_for_sale.pdf
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_1d26bbf862e647eebbed05f1d23b4d27.pdf?index=true
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_7a7c862c1fd5488eac3a2a60cc4d2428.pdf?index=true
    • https://s3.amazonaws.com/xuvamuba/aquatica_orlando_park_map.pdf
    • https://s3.amazonaws.com/fefurorobumi/financial_modelling_certification_courses_in_india.pdf
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_6eb0060b46a04a699111b31a16f3464d.pdf?index=true
    • http://bevamixebigal.epizy.com/audi_a6_2014_manual.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc86.bin
50fe32d00b20f2c56d1dffd0dac4a2b638a1c9a27fb7b4d3f73f4156ce72a139		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC86 5136 bytes
font_01_sfnt_off0000edf8.bin
49691af6e003d99be36acf5832599a109c2bdd9cf72714a9e67378c273f068ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 10212 bytes
font_02_sfnt_off000110de.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110DE 4324 bytes

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