Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf97050cf24ac065…

MALICIOUS

PDF

78.8 KB Created: 2021-03-26 18:38:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 33a80c47d839c26a80b5c07c929e963e SHA-1: 530fad17816c2a5539b190cfccde6e8ed2c5ccb4 SHA-256: cf97050cf24ac065ef57775fa8aa51af7a2c9fcadc585327a66bf9e572306feb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://fokemale.ru/wix?keyword=stages+of+fetal+development+worksheet PDF link annotation
    • https://rutejiredoratel.weebly.com/uploads/1/3/1/3/131383841/2055621.pdfIn PDF document text
    • https://logutidukikov.weebly.com/uploads/1/3/1/3/131380383/nawifozijiza-konuzizidomon-mizolu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497356/normal_60043100460a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477892/normal_6035e58ea89a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401732/normal_605b9fbd8b393.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/xajowu/glencoe_7th_grade_math_workbook_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f8336e4-032c-4db0-a6e1-b0b58a2f18e9/20828608470.pdfIn PDF document text
    • https://s3.amazonaws.com/musokejixami/dell_optiplex_3010_desktop_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50aa9b18-67d9-4ce9-af7a-6ad7ed05e46b/kijidiwafipowabexelis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c00934f9-d4c5-4769-b8cb-be79e9d09b91/what_are_some_interventions_for_anxiety.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33cc7ff9-c2a8-4b77-a854-7f205ff133e2/hymn_to_proserpine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78f718cf-8f0f-45c4-ade5-a7b7bc2f5d40/disney_world_fireworks_schedule_january_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/fundamentals_of_chemical_reaction_engineering_solution_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/sadlier_vocabulary_workshop_level_f_answers_unit_13.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90b2d5d2-832c-4b39-892b-b30122813304/85185523023.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/surofeku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbf7188e-659e-4e41-aa7e-42f60c5dc0a8/what_is_the_meaning_of_10000_reasons_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f1937e0-845f-4ab9-a2ea-5171e4ab3a56/79812253619.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77bc715e-450e-48d4-ae56-740a4652ad4c/night_shift_brewing_company_philadelphia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be6c1aa-ede8-4d26-83c5-704cdd326af5/how_to_setup_linksys_router_without_cd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc90940e-5f19-4f51-80d2-4bd4f26dccdb/physics_chapter_2_test_answer_key.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_off0000f4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C0 5772 bytes
SHA-256: 81e32925f578f8b942c46db5746b7acbc968d1dd4ff01731fec306186322e437
font_01_sfnt_off00010852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 10496 bytes
SHA-256: 8bf439e1ae8f9d9dc0c951d85416df6f2ed5fb040a8817daa579fcb29354ab80

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