Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3f530e4aa06912…

MALICIOUS

PDF

77.7 KB Created: 2021-02-03 01:22:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f3314bb3c95818de4ff92f2c36e2c52f SHA-1: 8c0a7ee2b5c1845d5b24de568662af8d29be5e57 SHA-256: 9d3f530e4aa06912f4d06e377131cd183e2b5f334fe5159eb1198395e7012aca
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URL points to 'baarspo.ru', suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=whistler+ws1065+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391008/normal_5ff5a3fe2232d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368477/normal_5fe59962166b5.pdfIn PDF document text
    • https://rorupuloloxotog.weebly.com/uploads/1/3/1/4/131409755/wajigagekeseketadag.pdfIn PDF document text
    • http://setovewurepenu.22web.org/23172786133.pdfIn PDF document text
    • https://seporulakokifo.weebly.com/uploads/1/3/4/5/134590723/danapapu-tokugiraw.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/jjCjeig/48693181709.pdfIn PDF document text
    • https://nibovipuduri.weebly.com/uploads/1/3/0/8/130814681/8322061.pdfIn PDF document text
    • http://ligazilafibab.22web.org/jiganigaligusupodiperi.pdfIn PDF document text
    • https://jitotapo.weebly.com/uploads/1/3/5/3/135314003/7004526.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/ibbKyAp/survival_rate_of_colon_cancer_treatment.pdfIn PDF document text
    • http://bifinisotipa.22web.org/whatsapp_plus_apk_file_for_android.pdfIn PDF document text
    • https://jewukezi.weebly.com/uploads/1/3/0/9/130970006/8578523.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/ijyHtO4/41513577995.pdfIn PDF document text
    • https://cdn.sqhk.co/wavefekus/fSjdNAx/7789661361.pdfIn PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/4843873.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/muvarelo/60314424178.pdfIn PDF document text
    • http://rilevoka.rf.gd/gift_card_holder_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/pesuvevipijenuxigotig.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/adobe_creative_cloud_desktop_client.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_off0000f098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 5500 bytes
SHA-256: f8710b0d6c77e3f15c19e178cb6a448cc075763bd7b5ddb501126bfb62e97864
font_01_sfnt_off00010340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10340 10840 bytes
SHA-256: fd92bca168f39044715e551c2ff8d7a9aa9674b9408c930bd46d6e753f53cf90

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