Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f3db2f1ca5f2a0…

MALICIOUS

PDF

81.2 KB Created: 2021-02-26 00:29:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: dfc268da2ab0a29616a4e492e239a939 SHA-1: ca6c0bbd8dc43a936515c9f83ec2a13c12587b3f SHA-256: c1f3db2f1ca5f2a0ed7676664bb90f0555114bf7ec7de3c67c52c12de860c13b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to 'seumenha.ru'. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and extensive external links suggest it's designed to redirect users to malicious websites, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://seumenha.ru/award?keyword=college+physics+2+formula+sheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470400/normal_6003b2d657edd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_5fe6f4dbe29b2.pdfIn PDF document text
    • https://godikifamubexi.weebly.com/uploads/1/3/4/6/134622632/95cde3a33.pdfIn PDF document text
    • https://wajefoxefibivi.weebly.com/uploads/1/3/2/8/132814680/pogeku.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/samsung_8.5_kg_top_loader_washing_machine_reviews.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390382/normal_5fec76a45e286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383795/normal_601179d359edc.pdfIn PDF document text
    • http://legendbilisim.com/knysna_forest_guided_toursgvfk1.pdfIn PDF document text
    • http://uscreditcheck.info/enbridge_water_heater_repair67xwe.pdfIn PDF document text
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/2879483.pdfIn PDF document text
    • http://polfact.site/12868357086um6ll.pdfIn PDF document text
    • http://covidcapsule.world/71608686966yik2s.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/9008332634.pdfIn PDF document text
    • http://watertea.space/16258590855dejk8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gogonof/coffee_bar_hd_video_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/58087353195.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/dj_rocky_babu_2018_new_song.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/chrome_browser_opinion_survey_android.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/seeing_is_believing_book.pdfIn PDF document text
    • http://pujumek.myartsonline.com/62300060765.pdfIn PDF document text
    • http://zitulogakapede.myartsonline.com/psychology_clinical_assessment_report_example.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF396 5464 bytes
SHA-256: 8a52a2867ac047d6f14553506754414285d0514c797c6e25ea5f625f1f9ab4a5
font_01_sfnt_off00010646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10646 10208 bytes
SHA-256: 0c4afc59c8a856677d09fdf2cabbcdacaa9842d53422c5a20043ae19c30ea9e9
font_02_sfnt_off0001292a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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