Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f68bc1fe91ec17…

MALICIOUS

PDF

84.2 KB Created: 2021-05-24 15:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c708c0505a0ce63d411c47896f08726d SHA-1: 317c96abe72c1d26aa144ef18731ee78cd03e1b3 SHA-256: c8f68bc1fe91ec174a0d72e3042e1b58f5d718f3406158d9424154aed9ea2270
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The PDF contains a large number of external links, with one pointing to zajinet.ru, suggesting a potential phishing lure or a link farm for SEO manipulation. While no scripts were directly extracted, the PDF structure and the presence of numerous external links are indicative of malicious intent, possibly to redirect users to compromised sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://zajinet.ru/strik?utm_term=is+shortwave+radio+still+used PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426828/normal_602c5e9ec9cb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447098/normal_60179e91d0a73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379846/normal_601bb75f1b872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_601bb2dfecbb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405638/normal_5fd32654591ad.pdfIn PDF document text
    • https://tarezusubem.weebly.com/uploads/1/3/5/3/135386237/jaborudura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487431/normal_5fdaffa7ad751.pdfIn PDF document text
    • https://feveronibamuja.weebly.com/uploads/1/3/5/3/135300243/vilikidemibu_xesikibexexuzu.pdfIn PDF document text
    • https://pixelisikug.weebly.com/uploads/1/3/1/4/131407736/zanimuforaloziwofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379611/normal_606409c0abea3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392453/normal_5ff49bed810ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450898/normal_603a16d6c6d1d.pdfIn PDF document text
    • https://lolizafopig.weebly.com/uploads/1/3/1/4/131453679/10289fe11b1b0b6.pdfIn PDF document text
    • https://vebavorosufate.weebly.com/uploads/1/3/4/7/134742301/dakijoboxo_rataremik_zemoverojubonut.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/dapekufoxiraku/pasoporamagu.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/64368086225.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/bibawananizutobisa.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/29394650104.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/lords_mobile_guide_resources.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/red_storm_rising_game_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/gelimobasamaraxokifesagok.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/english_spanish_dictionary_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/business_cash_flow_projection_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/walugumasobujo.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/3463306094.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/throne_of_glass_complete_series_hardcover.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_off00010b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B91 5004 bytes
SHA-256: 64f7b3caeace89aca3bf8bc3a05d7700381ea81ee8f0cb2c056136303884d334
font_01_sfnt_off00011ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA2 10748 bytes
SHA-256: 3eddd922cc9848dfba8b52aef367b1b6398506af08043dc5ba994b44033f8bf2

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