Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f523f31b1690149…

MALICIOUS

PDF

87.3 KB Created: 2021-02-27 03:17:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 919165180895c12a6349c1a5efab53d6 SHA-1: a90bdee05f852a9dcacf44ea61b3ea97b5b37ebc SHA-256: 6f523f31b16901492ad39588dc27f519c18ebc9a970b7e3a13ff28e30924b096
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the 'link farm' heuristic indicate a strong likelihood of phishing or malware distribution.

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
  • 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://leonvi.ru/123?utm_term=breaking+night+audiobook+free PDF link annotation
    • http://wadopipojadali.iblogger.org/2018_esc_revascularization_guidelines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_6037f32cc6166.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/how_to_pair_roku_remote_to_panasonic_tv.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/sewame.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428083/normal_5fd0924969e51.pdfIn PDF document text
    • https://kokesekodabese.weebly.com/uploads/1/3/4/0/134012443/138aeb.pdfIn PDF document text
    • https://rapagifetudi.weebly.com/uploads/1/3/2/6/132682686/3398461.pdfIn PDF document text
    • https://sefomaxezaniv.weebly.com/uploads/1/3/1/4/131483109/d5c8f39a0.pdfIn PDF document text
    • http://wenijivi.iblogger.org/16592357182.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402938/normal_6007efe8224f0.pdfIn PDF document text
    • http://fisidunetozusi.iblogger.org/bahubali_2_movie_hd_video_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464541/normal_5fe99a57ed3aa.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/22559461919.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459177/normal_60036efeae5bb.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
    • http://jugoribomepi.rf.gd/vuruz.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/how_to_program_radio_shack_remote.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_off00010963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10963 5092 bytes
SHA-256: 72b5204485c0eb3407974201f710d46bd9ff12f3df7bdb102b24e6478af2571f
font_01_sfnt_off00011aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAF 11452 bytes
SHA-256: 2bf25de0e134b2003094dfd5afb54dbd55a2083946109d12902b95a59a777adc
font_02_sfnt_off000140a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A9 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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