Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41866df4256c2e6…

MALICIOUS

PDF

74.3 KB Created: 2021-03-04 11:28:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7396a6637f5bc26fde36af7041690e6d SHA-1: b122d7251b96b0b1fb4ceedee8dbf44a00f9bc81 SHA-256: c41866df4256c2e6246346a851cdc38ee15d6c19421cd3d3796fa09c60c213e7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body and embedded URLs suggest a lure for downloading a "parts of speech book pdf download", which redirects to a link farm hosted on disposable domains. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest this is a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/123?utm_term=parts+of+speech+book+pdf+download PDF link annotation
    • http://lebedugipul.mywebcommunity.org/vabefufa.pdfIn PDF document text
    • https://cdn.sqhk.co/jijasitov/c2Hxifs/14993530714.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/is_there_any_reason_to_keep_a_landline_phone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464702/normal_60313f4fb6bd8.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/brother_mfc-8710dw_wireless_printer_setup.pdfIn PDF document text
    • http://20970907.net/guided_meditation_for_sleep_storygpvup.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/gfMzcZ5/72602135757.pdfIn PDF document text
    • http://idealica-it.website/jemajidefafevolu9ztln.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485448/normal_601190289228a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480758/normal_5fdf3e2fc9ba4.pdfIn PDF document text
    • http://matroskin.space/60685353949dc35b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_60240431408a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375086/normal_6036ccc25c6bf.pdfIn PDF document text
    • http://lakujalinifibo.mypressonline.com/state_employees_credit_union_hours_black_friday.pdfIn PDF document text
    • http://bisibometixo.mywebcommunity.org/7_times_table_chart_up_to_30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 5280 bytes
SHA-256: 3faf458f10ad6e3c378542844a74de98c0c80bc4741c5aae247b64418e2ded70
font_01_sfnt_off0000e8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A0 10920 bytes
SHA-256: b804536dd7c9fd0796924e6d67a359211a202fbf63d94aa69f5c889ed391581a
font_02_sfnt_off00010dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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