Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a88e8bf6ec526e0…

MALICIOUS

PDF

74.6 KB Created: 2021-03-16 07:38:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 785c6c46d2511c3507f64d226ab6797f SHA-1: 128aea2a85d4668ebebf412158deab2541103554 SHA-256: 7a88e8bf6ec526e0829a1708d95b59698f2f13f1fa4597a7fa6f0e058ff58696
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The file contains a large number of external links, many pointing to S3 buckets and Weebly subdomains, suggesting a link farm or redirection infrastructure. One of the primary external URIs, 'https://resalured.ru/wix?keyword=lmaac+middle+school', is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/wix?keyword=lmaac+middle+school
    • https://cdn-cms.f-static.net/uploads/4468289/normal_60223aa5a8405.pdf
    • https://fofirajajamide.weebly.com/uploads/1/3/4/6/134643930/kuzovowagovofixuwan.pdf
    • https://delovamubikener.weebly.com/uploads/1/3/4/7/134707073/boxikixiloruzabogug.pdf
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/067f3f8a7e7b71.pdf
    • https://zububeto.weebly.com/uploads/1/3/6/0/136082076/torizilijakade-dejuwokigagi.pdf
    • https://pixirexujana.weebly.com/uploads/1/3/4/5/134527097/4d99be22e0e6f2.pdf
    • https://vojutodebol.weebly.com/uploads/1/3/4/0/134096580/gubutofusipivetik.pdf
    • https://cdn-cms.f-static.net/uploads/4480904/normal_604aacc303187.pdf
    • https://cdn-cms.f-static.net/uploads/4486552/normal_601bba448b893.pdf
    • https://duxezixupedad.weebly.com/uploads/1/3/4/0/134095883/5577065.pdf
    • https://lifovidas.weebly.com/uploads/1/3/1/8/131856672/954287.pdf
    • https://static.s123-cdn-static.com/uploads/4422168/normal_5fe09d82a2280.pdf
    • https://cdn-cms.f-static.net/uploads/4381340/normal_600a74e7e2d3b.pdf
    • https://tozabofosizo.weebly.com/uploads/1/3/5/3/135340530/290947.pdf
    • https://cdn-cms.f-static.net/uploads/4451376/normal_603416c87c4a9.pdf
    • https://static.s123-cdn-static.com/uploads/4450878/normal_5fe5397b86ee3.pdf
    • https://jumuvive.weebly.com/uploads/1/3/0/7/130776409/7671016.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/piwanisaj/96811912671.pdf
    • https://s3.amazonaws.com/sefukirexuwekij/wink_live_mod_apk_terbaru.pdf
    • https://s3.amazonaws.com/xajowu/drawing_comparative_bar_charts_worksheet.pdf
    • https://s3.amazonaws.com/jaloto/37562746010.pdf
    • https://s3.amazonaws.com/wupixufekijax/24781200026.pdf
    • https://s3.amazonaws.com/sajezife/poxabaxirex.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d4.bin
95656737e3e9ec4fd6fbd6afd3f2d965e009d681534fcbb7e6fccc8569111dee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D4 5024 bytes
font_01_sfnt_off0000f8bd.bin
5bd40d38956ee3ae0f5d3016cb802005136c25f586dfe74d9030ce8e0e786e9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BD 10564 bytes

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