Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0109f15cecc4c7…

MALICIOUS

PDF

74.6 KB Created: 2021-02-26 17:43:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c0bb8b1df3da3ff7f2f1c61e71948175 SHA-1: 724104ffadb2393fcab3d4b76245c91ae0153f03 SHA-256: dc0109f15cecc4c756729799ebccebe3d5534b5d65a684175b12c66eb35c1327
214 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a PDF SEO link farm. The embedded URLs, such as 'https://crophysi.ru/award?keyword=vipassana+meditation+technique+body+scan', likely serve as lures to phishing or scam pages. The presence of numerous external PDF links suggests an attempt to manipulate search engine rankings or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=vipassana+meditation+technique+body+scan In PDF document text
    • https://boxorefo.weebly.com/uploads/1/3/0/9/130969922/5b240e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380403/normal_603068eceb789.pdfIn PDF document text
    • https://vakajufatig.weebly.com/uploads/1/3/5/3/135332685/53cc12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428341/normal_601628602fb98.pdfIn PDF document text
    • https://gimitowogavu.weebly.com/uploads/1/3/4/7/134746983/6a0e1f9e06fb485.pdfIn PDF document text
    • http://mafewagidimu.22web.org/6352916953.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466411/normal_600533f26ba00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404740/normal_5fe2052a2208a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449170/normal_5fdabc89d153f.pdfIn PDF document text
    • https://gosizunasinati.weebly.com/uploads/1/3/0/7/130739879/987591.pdfIn PDF document text
    • https://pamiwawoxok.weebly.com/uploads/1/3/6/0/136089952/79b4e884.pdfIn PDF document text
    • https://pajotesose.weebly.com/uploads/1/3/2/6/132681045/1c494.pdfIn PDF document text
    • https://kipopedetazezu.weebly.com/uploads/1/3/0/7/130775623/6989614.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444370/normal_5feef3a9acce3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lixuzo/carols_of_the_bells_satb.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/aimer_refrain_ga_sakenderu.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/mezojiminitoga.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/platform_game_background.pdfIn PDF document text
    • http://vejebuta.rf.gd/kawaii_home_hack_apk.pdfIn PDF document text
    • http://koxosam.rf.gd/vajusovazigawosokedojebif.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79C 5520 bytes
SHA-256: 476f7ad790f984a9d28ce06a89760ba77d2bc29ac57cf23e12fcec02847e3586
font_01_sfnt_off0000fa3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3E 10208 bytes
SHA-256: 61473155157c55f76c7d0a2c623e20634c295b3377e4860bfc932549334604f5

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