Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e61983f24801052…

MALICIOUS

PDF

76.9 KB Created: 2021-03-16 18:53:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 76351e6ab102231307e690671a1ae208 SHA-1: bfa972509b4a9d807b6dfde1a96c009635e63b54 SHA-256: 2e61983f24801052cb66e8f155edbeef4d0e790c9167bdef3d6fa4e714e1aba7
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 0.9998

Heuristics 5

  • 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 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://crophysi.ru/123?utm_term=autoimmune+hepatitis+practice+guidelines PDF link annotation
    • http://bogplaktnc.fun/adding_and_subtracting_fractions_with_different_denominators_worksheetq6dl0.pdfIn PDF document text
    • https://cdn.sqhk.co/dekorasenu/hhieyia/bamarokofelon.pdfIn PDF document text
    • https://nizufamira.weebly.com/uploads/1/3/4/3/134310662/tajifadumeju_reniwerexodosu_gagizif_widogiwowuboxu.pdfIn PDF document text
    • https://cdn.sqhk.co/wifavizen/2pabvo0/67318138347.pdfIn PDF document text
    • http://znakomstva18x.site/56804101283abtcd.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/gUX7biR/44508409209.pdfIn PDF document text
    • https://nutikatike.weebly.com/uploads/1/3/4/6/134601603/jofufedibenowub-tirol-wanalerumet-wavugidetatovo.pdfIn PDF document text
    • https://vizegibog.weebly.com/uploads/1/3/4/4/134458583/fojojedoxiwugejuput.pdfIn PDF document text
    • https://cdn.sqhk.co/taxeseta/xgjihdL/xonenuzixetazubiliratotux.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/8372ce3e-0e38-4164-b46a-5c8a3b6b897a/what_is_iliad_and_odyssey_all_about.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/98775252881.pdfIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_0b166d0b59b14a70956c4a2d9903a6cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/35e9e538-1299-471a-8d4c-117f24bde8bc/33155006552.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/795b5761-31f7-43b0-a3d4-673368d82fcc/68627031467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73e91e00-0015-4598-afb7-9bc584df3155/zefosaj.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/1738117650.pdfIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_9326f3a4077b4da592e8eda9c7e82753.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/56963303970.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/the_bent_twig_isaiah_berlin.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_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 5476 bytes
SHA-256: 72755c0a406f7032f57e27897668f4ef230af8be5b36663100edc702d0653547
font_01_sfnt_off0001022c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 10476 bytes
SHA-256: a80c6cd07370b32b0d2d4adaf1daec2090773add57bc72e563738a401204d073

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