Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83a57b2d7bd2a5e…

MALICIOUS

PDF

87.0 KB Created: 2021-04-14 12:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 43b2c69b04afac930f881d062746fe22 SHA-1: 24db9f9256653a816b282e9077f37c93e0f8e35c SHA-256: d83a57b2d7bd2a5e0591ae2859ddab934b8364572fe78756c1d2c6a85c3b35fe
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a potential second-stage payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for malicious links, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/strik?utm_term=are+sub+zero+fridges+worth+the+money PDF link annotation
    • http://itdomen.fun/39221004792w1fb5.pdfIn PDF document text
    • http://kartaidatodemeleri.com/boxhead_vs_zombies_unblocked5837o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419433/normal_60672fd0e43b2.pdfIn PDF document text
    • https://walipovagotil.weebly.com/uploads/1/3/6/0/136016519/487eada73.pdfIn PDF document text
    • https://kejuzeke.weebly.com/uploads/1/3/4/4/134456394/5aac6c051d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469351/normal_601e84fb60538.pdfIn PDF document text
    • https://puxajibixitukus.weebly.com/uploads/1/3/4/4/134457664/76ff33358a23fd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384028/normal_603d8352ed023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426063/normal_604ed21cc7649.pdfIn PDF document text
    • http://ludshop.xyz/25284634934rrefc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482847/normal_5feb443daac29.pdfIn PDF document text
    • http://legalvictory.group/93376018705gwmjn.pdfIn PDF document text
    • http://dalifajebuxog.scienceontheweb.net/95370477143.pdfIn PDF document text
    • https://letosuve.weebly.com/uploads/1/3/0/7/130739520/e49575ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d7a2ee9-aea9-4567-aa4e-9056c8d42399/91508082201.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/how_do_i_use_google_translate_offline_on_pc.pdfIn PDF document text
    • http://rotufixijisadi.onlinewebshop.net/pavax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c57c91ab-5375-4ccd-bdc5-ed8bc376d174/lupaliperolagut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c2b843f-9073-4bd6-9c2b-41117288dae6/zivugivopeg.pdfIn PDF document text
    • http://dovunufesesiz.onlinewebshop.net/78065430001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ef8e25f-e60d-49c0-a70b-c691752b95ae/7412594292.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/advanced_trauma_life_support_9th_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/vafizet.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/grade_10_maths_worksheets_south_africa.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 3512 bytes
SHA-256: 5273409c421012bde8f57f6e78f4e0674ca7d79b2c5987de75fbab8cddeee13a
font_01_sfnt_off0000ff79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 5452 bytes
SHA-256: 80558c84686279dc20529f0904ea7be8b6171042baf9874f1888c68c23588d36
font_02_sfnt_off000111fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FA 11340 bytes
SHA-256: 088d92623637852818bff3ec5adf129001ebbd31f8121a534e46f89602ed8cd3
font_03_sfnt_off0001386c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386C 16064 bytes
SHA-256: 1398bbf2dfd9cae4409d1d8ab67a79f495e147aa07cce54436be1c2862721d78

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