Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95cd82b537c983c…

MALICIOUS

PDF

95.0 KB Created: 2020-11-24 17:45:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c4f062d888f42294d19e2ea16b1fb7c SHA-1: 7c5b229ee53beb1701e5ebfac497063eece0c308 SHA-256: d95cd82b537c983ce2f4d30f570c69394e9912415fcf5c44eba3724126206bbd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. The primary URL, 'https://traffnew.ru/strik?utm_term=integrating+logarithmic+and+exponential+functions', suggests a lure related to mathematical functions. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan. No scripts were extracted, but the structure and heuristics point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://traffnew.ru/strik?utm_term=integrating+logarithmic+and+exponential+functions
    • https://pekireraseg.weebly.com/uploads/1/3/4/7/134720831/pozeregativewewu.pdf
    • https://cdn-cms.f-static.net/uploads/4488330/normal_5fb7c0386eceb.pdf
    • https://cdn-cms.f-static.net/uploads/4460975/normal_5fa9c09cc9356.pdf
    • https://cdn-cms.f-static.net/uploads/4390637/normal_5fa0604f7df5a.pdf
    • https://cdn-cms.f-static.net/uploads/4453730/normal_5f9f3f09816c1.pdf
    • https://kuromazu.weebly.com/uploads/1/3/2/6/132695519/povixodizimebokib.pdf
    • https://foxagizak.weebly.com/uploads/1/3/4/3/134332010/8089521.pdf
    • https://cdn-cms.f-static.net/uploads/4374703/normal_5f8e5e5eaac92.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/56cc823d-03b6-48ec-94d2-238b0a272ed2/mamovugiluwig.pdf
    • https://uploads.strikinglycdn.com/files/55ac8c35-ef8d-4224-a58e-fd782df2a5ad/rufulerodal.pdf
    • https://uploads.strikinglycdn.com/files/5a74dcc5-210a-483c-9f47-e4a8e311b290/properties_of_logarithms_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/9605c6d9-2630-4c6c-b62d-450ddfb35208/nefidadarudajan.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012f43.bin
6ce021fb061d45b02c2624ae61c420a9f4896846c5c237cb1d8cf24f1b0337f3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12F43 27760 bytes
font_00_sfnt_off0000f663.bin
18cf3a94e74ee6eb42e04547dd02e3d378e0317ead9d5cb730a51dfbab2bfc65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF663 5456 bytes
font_01_sfnt_off000108ba.bin
9b1a9765faeed04b6e7f1c36187cf21a8ee475f700abd1383e426edb4c1349f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 11172 bytes
font_03_sfnt_off00016068.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16068 4324 bytes

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