Malicious PDF — malware analysis report

Static analysis result for SHA-256 267a83391924b28f…

MALICIOUS

PDF

80.3 KB Created: 2021-03-07 23:12:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 443d3c890fd66d92f7599699b6ad1961 SHA-1: eaed2b013a2f44d4f67fbbcd9a8f52f4fe6d34ab SHA-256: 267a83391924b28ffa31d88a7563badcccaf8d60591d4ef705256a1cc9723baf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a lure related to attaching sandpaper to a power tool, but its primary function is to host a large farm of external links, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • 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://maypoin.ru/strik?utm_term=how+to+attach+sandpaper+to+black+and+decker+sander PDF link annotation
    • http://xivagoz.22web.org/47819072367.pdfIn PDF document text
    • http://xotuvezaramapez.22web.org/farinexafizunatit.pdfIn PDF document text
    • http://stylecurtains.com/mepaginozuxoben8l6md.pdfIn PDF document text
    • http://nakenanizugaxit.iblogger.org/mcdonalds_questionnaire_answers_2017.pdfIn PDF document text
    • http://topsol.xyz/how_to_force_tivo_software_updatek6hj6.pdfIn PDF document text
    • http://wanulutipumik.iblogger.org/fur_elise_music_sheet_for_piano_easy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_8d04da8b988143d0990b545adc7613f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ffd04b-f024-4116-bef3-06dc7bc93f56/beats_studio_3_wireless_headphones_black_and_red.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0a9ef69-7521-4698-935a-80d01376ca19/zivofipebejudovet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c38afbf-c87f-402d-ae89-cb7615ad902b/is_dragon_dictation_worth_it.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/marketing_internship_cover_letter_template.pdfIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_c1e64a2d8fbf4fbe8dc731db1117136c.pdf?index=trueIn PDF document text
    • http://gufobipadu.epizy.com/answer_key_group_d_2018_haryana.pdfIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_95c4f70c3b304350908393ed7132014f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/929fe84a-0e3f-4904-9a60-f8290682774c/dyson_dc35_head_stops_spinning.pdfIn PDF document text
    • http://rumawotipu.epizy.com/vinuva.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/telecharger_avast_antivirus_gratuit_pour_android.pdfIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_dfc0968e37934718af585ec308059c3c.pdf?index=trueIn PDF document text
    • http://nenidexixod.epizy.com/ctet_paper_1_february_2016_answer_key.pdfIn PDF document text
    • http://tokavasetalan.epizy.com/72914162127.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ea7bb1-81e5-47fa-a812-12dd7fe06093/xizoler.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/kentucky_drivers_test_answers.pdfIn PDF document text
    • http://tunowik.epizy.com/zolutabiwetevufe.pdfIn PDF document text
    • http://xuduxabizova.epizy.com/of_plymouth_plantation_think_questions_answers.pdfIn PDF document text
    • https://3c45aaf8-24f3-4cde-9773-cf44a0a970d3.filesusr.com/ugd/ae7d54_5924b89c34e54fa5b59973b96a1bc9e8.pdf?index=trueIn 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_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 5416 bytes
SHA-256: 85c000388009144027318c4fa89f0be8f29b0e76e844ad62f9feb9853dfceb35
font_01_sfnt_off00010c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C45 11284 bytes
SHA-256: dd718e3f08211481a0e432f3add92a9aea1bea3c04e58ce73cff318428299503

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