Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d6a0ec1acd3b3a…

MALICIOUS

PDF

74.4 KB Created: 2021-02-12 02:18:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7b00ba9d10d43053666e31362ab5644d SHA-1: 4dc464891d67d775d8c73fef4558b0c91c2a51f3 SHA-256: b6d6a0ec1acd3b3a6d1b535260b041b0ca6ea1dd5b295d8fa7897168229bb2e9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation.

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://bologen.ru/wix?keyword=reedy+creek+park PDF link annotation
    • http://jusefaw.22web.org/carnegie_learning_skills_practice_answers_algebra_2.pdfIn PDF document text
    • http://tells.fun/reference_angles_in_radians_worksheet8hhpn.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/h7XgZON/75937147050.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484635/normal_5fddda1248c52.pdfIn PDF document text
    • http://meetsalle.xyz/19429565575v5fxd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469852/normal_6019cbb1a0e06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427274/normal_6021d0fb60251.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/ibjhicc/18949485199.pdfIn PDF document text
    • http://girlsbeach.space/84061803771re37d.pdfIn PDF document text
    • https://cdn.sqhk.co/xubenijevewe/gd6ge0Q/learnzillion_guidebooks_grade_5.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/0Uibggg/python_calculate_percentage_of_two_numbers.pdfIn PDF document text
    • https://cdn.sqhk.co/sitosuduf/FjjQnij/alarm_sound_effect_mp3_free_download.pdfIn PDF document text
    • http://palejep.22web.org/56425491961.pdfIn PDF document text
    • https://riluvozig.weebly.com/uploads/1/3/4/3/134380056/rokasekopumaruw_tejegor.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/pivetuzadujo/baldimore_s_high_school_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/carnivores_dinosaur_hunter_pro_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/23706608175.pdfIn PDF document text
    • http://gaxufaxurawago.epizy.com/surf_report_lafitenia_magicseaweed.pdfIn PDF document text
    • http://zewogukanonudut.epizy.com/jbl_endurance_sprint_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/60253352037.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_off0000e6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F4 5028 bytes
SHA-256: 427a17082672d08adad04da3a64230bc8961b108a6d781ab8f7702b143aed26c
font_01_sfnt_off0000f831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 10540 bytes
SHA-256: 0897310ba3847fd53050bfbd2ae0ff87240cff6c0be9a86e0e0d39bfa341f86c

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