Malicious PDF — malware analysis report

Static analysis result for SHA-256 031cd962944998ea…

MALICIOUS

PDF

74.6 KB Created: 2021-06-11 08:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7cbdc69e9a05512d169f2ddabc861b58 SHA-1: 8504b9c960414b175c6e1675bee2aa2b09548d62 SHA-256: 031cd962944998ea245e907efd179264a10bf8df1bb5933e6e5ff852147c83d9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'smidgel.ru', suggesting a phishing or malware distribution attempt. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent by indicating the use of link farms on disposable hosting to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/pbw?utm_term=led+wall+background+video+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464524/normal_6016e6273dea6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479902/normal_6023166ab9845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427268/normal_606cbd2d5e45b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_602f2c7849dd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484097/normal_600f45b53dee8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://botinuba.pbworks.com/f/lerukesesafuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/944a7561-6ef2-47e7-b3da-5c6f3bde0945/how_do_you_do_s_hard_reset_on_iphone_8_plus.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/w/file/fetch/144623181/glencoe_geometry_chapter_5_study_guide_and_review_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f5ed88c-a4ea-4726-ab3c-bb6b29780050/folik.pdfIn PDF document text
    • http://mukibilevejo.pbworks.com/w/file/fetch/144468642/is_downloading_cracked_games_illegal.pdfIn PDF document text
    • http://nimojugaf.pbworks.com/w/file/fetch/145051764/duzupororuzowari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59b8442a-5e51-4123-a0d8-6f04ee4da25b/8484254373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/353b6a4c-48e3-4752-851a-3ffbdbc0e424/99790592660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35adee25-6c9a-4b14-8470-a9045458ef87/76826355717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a656acb3-6a71-48ba-b6bd-4b4ae16d335c/startup_investment_proposal_template.pdfIn PDF document text
    • http://mosutit.pbworks.com/w/file/fetch/145095207/what_to_write_in_a_personal_profile_cv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61aa0cda-f69a-4d04-9642-e2964ab8b337/50430575736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01189480-8bb6-49c3-bc40-a5e4b66ff71c/86138409159.pdfIn PDF document text
    • http://kuduwoxux.pbworks.com/w/file/fetch/144806031/3218972059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c16471f3-2db5-402e-aaeb-21c2ff5617be/michel_foucault_discipline_and_punishment_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20bfab5a-45a0-407f-8dc5-33354f47e5fe/20223093354.pdfIn PDF document text
    • http://mupalunava.pbworks.com/f/what_is_bibliography_and_examples.pdfIn PDF document text
    • http://noxiwako.pbworks.com/f/how_can_i_change_my_telegram_group_link.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/f/47990855972.pdfIn PDF document text
    • http://fiwonotexo.pbworks.com/f/how_to_replace_ebt_card_nj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98ff3a71-963c-4189-9c72-5c19af7a110f/5461976414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f86fcfc-c2aa-4407-ba97-adc00ab57bee/gimuguku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/029cc977-1fef-454f-963c-76fd9d65482d/75616531317.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_off0000e3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A1 5308 bytes
SHA-256: 27ed5a72de988a1ac4b7fb06703a5c19e4ef17b5e1fcdc68f85ed639d38ad646
font_01_sfnt_off0000f5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 11164 bytes
SHA-256: d7780f421c51aca743656ae99a5e76bb5f91d7071a025a5f978118f9c8fd9917

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