Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a73a369846917ed…

MALICIOUS

PDF

75.5 KB Created: 2021-05-02 18:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 93a1290f71c8bb50499a4a76cc135f96 SHA-1: 5b8ca004074ade9d1255eec730c68504b1c51ab2 SHA-256: 3a73a369846917ed58beb70db5bea91d86b0f5b1c22a8115809d4c8bcacaa754
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 0.9997

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://botokaw.ru/strik?utm_term=what+is+the+summary+of+the+book+called PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369307/normal_600b6f716635c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470678/normal_5fe9cd032b2a3.pdfIn PDF document text
    • http://votixibutiro.medianewsonline.com/cable_gland_selection_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454990/normal_6044fe49bac12.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/1042562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375194/normal_60427acc82366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449178/normal_603fb93bd5851.pdfIn PDF document text
    • http://rafidoletusamox.22web.org/damoridokaput.pdfIn PDF document text
    • http://fedexonep.mypressonline.com/dufanisowus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484820/normal_6059cfec946c3.pdfIn PDF document text
    • http://dalidusiz.mywebcommunity.org/essay_writing_examples.pdfIn PDF document text
    • https://bimipesetasezi.weebly.com/uploads/1/3/4/0/134017520/5021872.pdfIn PDF document text
    • https://wewuketis.weebly.com/uploads/1/3/5/3/135327502/rugitamazef-barekuvixinib-tafenabibiteb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379237/normal_5fcca473c8617.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff9ac278-903c-4cbb-87df-14404390b659/speak_book_club_questions_for_the_guest_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da5286b3-b436-4164-b3aa-ac1d12459e1d/23053889294.pdfIn PDF document text
    • http://pogunetosomexaz.epizy.com/what_is_shared_knowledge_tok.pdfIn PDF document text
    • http://luvenawow.epizy.com/hoffmann_bromamide_reaction.pdfIn PDF document text
    • http://vavipok.epizy.com/16159003649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e37398c0-46f2-4367-a587-4fe5a2f6ca97/gixenewibupuximod.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_off0000e7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 5580 bytes
SHA-256: 72def2f8cb895b5e7da2c14182ead9ca07500bd9f953c836d8bf21c6f1c594b4
font_01_sfnt_off0000fa9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9E 11124 bytes
SHA-256: 2dd5c5a82fb66021e5a4c7931c6c826c3235eac4f8122bcfec6b35165b8072ce

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