Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c2501b572c79cf…

MALICIOUS

PDF

72.2 KB Created: 2021-05-06 01:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6f459a81d60974ce519f18319e439bae SHA-1: e02b03b9eb2a02b17ed7dd63d24ad1dc5a547aec SHA-256: 82c2501b572c79cf99f8787725d9794047cbb4bbbf4c926fc08ec871392e762d
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to multiple external URLs, one of which is `https://jottigo.ru/strik?utm_term=comparing+and+contrasting+arteries+and+veins+veins+have`. This suggests the document is likely used for SEO manipulation or phishing, attempting to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/strik?utm_term=comparing+and+contrasting+arteries+and+veins+veins+have PDF link annotation
    • http://pobesegu.scienceontheweb.net/57218828073.pdfIn PDF document text
    • http://durowan.sportsontheweb.net/mejujefojakasusatutav.pdfIn PDF document text
    • https://nuduxojobiri.weebly.com/uploads/1/3/4/6/134629521/9999998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455396/normal_600feb0ce5463.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405925/normal_6053508644188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450003/normal_605b44cc152a0.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/sizagemelebukalorogebe.pdfIn PDF document text
    • https://xoluvaxabezil.weebly.com/uploads/1/3/4/3/134338990/jatiza.pdfIn PDF document text
    • https://zekaxuwamawebi.weebly.com/uploads/1/3/5/9/135961115/tofepajemef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495244/normal_5ff877bc0f8db.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/aditya_hrudayam_stotram_telugu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_1342bef3f7034f99ad02b844ee376f49.pdf?index=trueIn PDF document text
    • https://0c43c058-97b3-435a-b041-a9f001bfa883.filesusr.com/ugd/791d74_e6c2ed06c6244a28a89f4bcc8a9b8a30.pdf?index=trueIn PDF document text
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_2aeaa1bc8b52424ba23ac1a8f3495c47.pdf?index=trueIn PDF document text
    • https://10bc5e17-7652-4c7e-9b43-999b3eb3b021.filesusr.com/ugd/5edc69_316166ff19bd4221ba7d7dcff06c6163.pdf?index=trueIn PDF document text
    • https://bc13a564-db4d-4abe-bba9-081b1c4085ef.filesusr.com/ugd/d5ec75_92edf5d2a52344be90061f992f1ab217.pdf?index=trueIn PDF document text
    • https://b27aca93-056c-4dd2-83a6-fd909c9f709d.filesusr.com/ugd/2ba3ac_80d007ca753945ea9574dd8e2d1a3d36.pdf?index=trueIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_9b8fb792321e4076bb8064ba9196ed8b.pdf?index=trueIn 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_off0000dd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD61 5420 bytes
SHA-256: 7579f9bc0b1fb8e5992af08a259dc0f605e2fb04473278cff5fad2e912ca5333
font_01_sfnt_off0000efa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 10504 bytes
SHA-256: 947a010174ba27a2994fe40bfa1c804c41dc84611d016a799f6a956a88c87805

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