Malicious PDF — malware analysis report

Static analysis result for SHA-256 633b8d1e9e15d7cf…

MALICIOUS

PDF

108.8 KB Created: 2021-03-11 12:31:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 328babe143c7b4334813de47175abb50 SHA-1: 5738707fc48b1a251ea995a8b1f76b3049077854 SHA-256: 633b8d1e9e15d7cfcb2de401a4626cd1e37c4c751ad5098b09be0620b2c486a4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://jottigo.ru/123?utm_term=install+android+os+on+blackberry+z10 PDF link annotation
    • https://cdn.sqhk.co/lajakukilo/cxghshj/wiki_for_cod_warzone_modern_warfare.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/iPhdwjb/patching_holes_in_wood_floors.pdfIn PDF document text
    • https://cdn.sqhk.co/ximegawaso/gheihgg/49859227561.pdfIn PDF document text
    • http://pobegikobej.iblogger.org/slopes_of_parallel_and_perpendicular_lines_answers.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/zanowuruwazarukopejezoxi.pdfIn PDF document text
    • https://cdn.sqhk.co/noruwotil/igyLJZg/benefosadebopurewawiwe.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/86348261956.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lidewez.epizy.com/deadlift_form_muscles_worked.pdfIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_c1f48d58843c49cfaad4a72236555f4e.pdf?index=trueIn PDF document text
    • http://lenofafezanobu.atwebpages.com/annual_leave_policy.pdfIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_fefc1a651f7d489a8d1d27712e1c053f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/167e0b7a-1d8c-40e2-8a92-7d0c07216093/how_to_program_honeywell_home_alarm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e525da8-c91f-40bf-94ba-071db77cc52f/how_to_write_a_letter_of_recommendation_for_pre_med_student.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58dc8020-7437-471b-9a8b-bdd2d5f98fbe/vufugejuxusi.pdfIn PDF document text
    • http://roluvad.epizy.com/free_grade_3_english_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/64623557457.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/ecommerce_website_templates_html_free.pdfIn PDF document text
    • http://dezinolabebosod.atwebpages.com/39427842468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d93fe8c3-72e4-44ca-b394-ecf7e5791fb1/schaums_quantum_physics.pdfIn PDF document text
    • http://potovoz.rf.gd/briggs_and_stratton_power_washer_3000_psi_manual.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_off00016cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CBB 5420 bytes
SHA-256: 2cd11f6140a342c9ce0c5c524e31614e7e19a298ed14577954f705c5bd6acfc1
font_01_sfnt_off00017f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F46 11264 bytes
SHA-256: b2e20e7a92fc9d64f43520a5badf3cae2ce0ad804497322335698865d3e0cc23

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