Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ec47e62b0cf64b…

MALICIOUS

PDF

80.7 KB Created: 2021-01-24 08:00:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 117e017b214d5952a9694ddfdc1fb168 SHA-1: f2765d543ab2428973178b7da16c49c01a5c67aa SHA-256: 77ec47e62b0cf64b2040fb01d3d86b7cd398f3ff2ff09904c54864dce0a2571a
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and redirectors, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=dear+girl+book+review In PDF document text
    • https://cdn.sqhk.co/nuxarufodir/40iMBQm/hearthstone_battlegrounds_patch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380858/normal_5fcf0106e5e66.pdfIn PDF document text
    • https://gutamunimidujad.weebly.com/uploads/1/3/4/6/134667749/4a9eb99dc992f6.pdfIn PDF document text
    • https://site-1178466.mozfiles.com/files/1178466/1636283136.pdfIn PDF document text
    • https://site-1171643.mozfiles.com/files/1171643/52095653646.pdfIn PDF document text
    • https://cdn.sqhk.co/tunaluvum/vIYgicg/89897469192.pdfIn PDF document text
    • https://kifewuwumezoduk.weebly.com/uploads/1/3/4/7/134740170/peworos.pdfIn PDF document text
    • https://site-1201991.mozfiles.com/files/1201991/we_bare_bears_match3_repairs_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487416/normal_5fe3b5f080bbf.pdfIn PDF document text
    • https://cdn.sqhk.co/wejideduv/dageiim/zaxowekusudugafipiwep.pdfIn PDF document text
    • https://site-1178726.mozfiles.com/files/1178726/zudavaferadogafuped.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366018/normal_5fec91207401b.pdfIn PDF document text
    • https://site-1083678.mozfiles.com/files/1083678/35759462209.pdfIn PDF document text
    • https://cdn.sqhk.co/balapakufogo/bBLRidQ/nursery_rhymes_songs_list.pdfIn PDF document text
    • https://site-1178414.mozfiles.com/files/1178414/54997153597.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lekezaru/afip_siradig_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/net_book_value_balance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/bikodula.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA15 5032 bytes
SHA-256: f03b8a7142c5e117995d4b3c9a44796c8919b557fb54b3bb2463dc1107171fc0
font_01_sfnt_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 10812 bytes
SHA-256: 7d3cbd33130fd289c07ab342ecf7a2b4d1e9fbeda8871e67087867fbd5825500
font_02_sfnt_off00012054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12054 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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