Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c5b533fe7f8a8a…

MALICIOUS

PDF

69.9 KB Created: 2021-02-21 03:48:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 146ab4cbc2b82f113d5e50a493d8c89f SHA-1: aa0fd32623f0b2cd8adb60a7cd2c3b75d50330e7 SHA-256: 71c5b533fe7f8a8aba2dadeeb99bbbd86027410914b3bedae8546c2662e9eb06
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirector infrastructure and disposable hosting, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to redirect users to malicious sites.

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
  • 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://yafferge.ru/strik?utm_term=bowflex+pr1000+parts In PDF document text
    • https://cdn.sqhk.co/toromerepowa/ghjfgi9/zombie_diary_2_hack_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/gg8Clha/37060549629.pdfIn PDF document text
    • http://aov.one/can_an_old_battery_be_rechargedsj3rm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446398/normal_5fdf821ee8fc3.pdfIn PDF document text
    • http://trenketo.buzz/ark_base_buildr7ybt.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/SSifZgi/81317661577.pdfIn PDF document text
    • http://zabavnyi-slon.ru/how_to_replace_samsung_tv_remote_controls7tza.pdfIn PDF document text
    • http://kindraretterath.com/funny_chicken_wallpaper_for_android7dl1a.pdfIn PDF document text
    • http://jijimaxugixu.22web.org/86613492994.pdfIn PDF document text
    • https://cdn.sqhk.co/remokuvupen/3jjjjii/warship_games_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417037/normal_600fa4e7457e8.pdfIn PDF document text
    • https://cdn.sqhk.co/dogovonediwa/6igr3hf/kritarchy_definition_webster.pdfIn PDF document text
    • http://uber-global.com/space_launch_report_falcon_9rjvh1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449014/normal_6026dd5b101a8.pdfIn PDF document text
    • http://my-favshopd.online/arduino_can_bus_tutorialulycj.pdfIn PDF document text
    • http://all-system7.work/ejercicios_de_derivadas_1_bachillerab3f82.pdfIn PDF document text
    • http://digitalmicroteter.xyz/nijenizafurumazubize0ey9x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nimetegukixiz.rf.gd/english_grammar_notes_free.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_off0000d4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BC 5300 bytes
SHA-256: 6eff7bf54fc0247c92b5e7911380bb89bddd5fab1a1fed02ccf2b1ef0bfcb890
font_01_sfnt_off0000e6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 10512 bytes
SHA-256: 96bd01beb4cb63489ff9a5a27c4dc47421939b7483b88d5b898d648ed5b66e09

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