Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cf965136969ce3…

MALICIOUS

PDF

77.1 KB Created: 2021-03-18 04:25:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 76467a54d54106d560c74c9ce706b7a1 SHA-1: 9d8414f9cdf5d53f6453d0080c83654ab7a76fb6 SHA-256: 86cf965136969ce3ca9f6f41d28bd50012f305c6f060e92c9703afc7e4f99023
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and SEO-optimized content, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/wix?keyword=nyc+doe+2020+calendar PDF link annotation
    • https://cdn.sqhk.co/xugiwatokax/a4jgVSN/lirimulasagagiluxugo.pdfIn PDF document text
    • https://cdn.sqhk.co/medijamowole/giH5gy2/subject_pronouns_spanish_practice_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402297/normal_605282d8cbd0a.pdfIn PDF document text
    • http://pawusewi.sportsontheweb.net/accountability_ladder.pdfIn PDF document text
    • http://bupimobim.sportsontheweb.net/dieta_cetogenica_50_dias_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/ejawojb/retractable_crowd_control_barriers_canada.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/why_do_narcissists_love_borderlines.pdfIn PDF document text
    • https://cdn.sqhk.co/rojotuwo/8TU0ijD/telangana_gattu_meeda_chandamama_naa_songs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412170/normal_5fed824199710.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/2vBuhhP/76490346358.pdfIn PDF document text
    • http://duxinivodozular.mywebcommunity.org/irobot_roomba_770_charging_error_5.pdfIn PDF document text
    • https://cdn.sqhk.co/sinewuvemomi/gihu5ij/voice_access_app_for_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387816/normal_600dd739d4cd1.pdfIn PDF document text
    • https://cdn.sqhk.co/ratufewebu/VLhaEUX/51372066556.pdfIn PDF document text
    • https://cdn.sqhk.co/lowixadoges/ghhiln4/zombie_assault_apk_mod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375342/normal_5ff32e291a52b.pdfIn PDF document text
    • https://cdn.sqhk.co/lusimalifa/Mfzgd4w/duvemapom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_73631615caa346ea825d65d59d8fe914.pdf?index=trueIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_5e04d87fb3b942978427fac87ee34a43.pdf?index=trueIn PDF document text
    • https://755d026c-fd58-4633-9ca9-8af24261f473.filesusr.com/ugd/4622eb_bd9cd825be9c4f2e988ada3d754cc47d.pdf?index=trueIn PDF document text
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_8d032ab2c1d3416fa102f97d0b222ea7.pdf?index=trueIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_53ea2106910c4f07b18402d0ffd23516.pdf?index=trueIn PDF document text
    • http://kakasis.onlinewebshop.net/9910576826.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_off0000f0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 5100 bytes
SHA-256: a8518c9be65f24698d22aba43732c48856992893c240fdacc1f98c4ceee479da
font_01_sfnt_off00010230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10230 10364 bytes
SHA-256: 460a117e5b8739361bfd571b6de92b298ba6ae5105ad8918dd0bddc7fa4de80a