Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4cd526cedba895…

MALICIOUS

PDF

77.1 KB Created: 2021-01-22 00:41:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1a7f01823a03e863218b64c580a3103c SHA-1: cf97701f18a1272f1b306decea26ddad75e9a31f SHA-256: bf4cd526cedba895c3a8f538429d8fea01f87dea0dbed3a384cd57bfa6a873f3
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, disguised with a lure related to passport renewal. The document is classified as malicious by ML and ClamAV, and heuristics indicate it's a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and malicious link strongly suggest an attempt to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=pakistani+passport+renewal+in+california In PDF document text
    • https://cdn.sqhk.co/videmixolute/KrV0iik/zisola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459636/normal_5fd68d3d04d35.pdfIn PDF document text
    • http://xinupavob.iblogger.org/hell_let_loose_engineer_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/ribovonubod/hOyufhb/pokemon_go_news_june_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373240/normal_5fedc242e5e38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374535/normal_5ff0e1bba8bc0.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/h2Ijgha/bubble_bobble_classic_download.pdfIn PDF document text
    • http://zikuwojanubeg.iblogger.org/80360908470.pdfIn PDF document text
    • http://xupenirulavep.iblogger.org/android_constraint_guideline_percentage.pdfIn PDF document text
    • http://nokutanebufevon.iblogger.org/karikonisuvuzime.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://lodabaximuxulul.epizy.com/coffee_meets_bagel_apk.pdfIn PDF document text
    • http://napilidowolaro.rf.gd/free_cursive_writing_chart_printable_worksheets.pdfIn PDF document text
    • http://lisunamubeso.epizy.com/samsung_smart_blu_ray_player_apps.pdfIn PDF document text
    • http://jedirolin.rf.gd/xamarin_android_carousel.pdfIn PDF document text
    • http://kikexufan.epizy.com/77982607080.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/55621087117.pdfIn PDF document text
    • http://pimuxexud.epizy.com/fat_face_jeans_size_guide.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_off0000e2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 4952 bytes
SHA-256: c4812ab8c75883919d71046a73be7dd644e9e711a190a68c12d35b865a8123ac
font_01_sfnt_off0000f3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B6 10776 bytes
SHA-256: 7232872c8ffb399bb603f2f80ea1c74571d452ff683ab2ddad5a8c5776272b31
font_02_sfnt_off000118a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A4 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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