Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9eb67a1f945658…

MALICIOUS

PDF

87.2 KB Created: 2021-04-03 21:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4bacdecc4a912fd1d5a594fa55330c3d SHA-1: ef4d84058f12e7a2c7280aea3a2dcb99bb3f305f SHA-256: 7c9eb67a1f945658a6dbacf118997e0b45b7ef8e91d94e2e313d0c947b051e7a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/strik?utm_term=descargar+cne+lista+tascon+gratis PDF link annotation
    • https://cdn.sqhk.co/toledexipez/hbeEMhg/childrens_converse_size_guide_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/dodirijobadi/rijojdG/bugalumurow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408720/normal_605d0a83a12b7.pdfIn PDF document text
    • https://cdn.sqhk.co/vugasoveg/jbZsZji/deepest_trench_in_southern_ocean.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454304/normal_5fcc73a7beffe.pdfIn PDF document text
    • https://cdn.sqhk.co/ritapabinap/fgjifjd/waze_app_funny_voices.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387938/normal_6027d50f0d846.pdfIn PDF document text
    • https://cdn.sqhk.co/mudifuto/pYifhiF/the_zombies_band_merch.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_0c15446d959a4a82b53f15637dc0759b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9154ae9c-edf7-45bb-8b5a-335d25597c6c/world_map_printable_activities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6eb1390-3cf5-4f79-b3d2-b54f6e3c5ac1/44812774395.pdfIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_c94a011f3e274ba3b4e9b44352f71040.pdf?index=trueIn PDF document text
    • https://78f121e6-5824-477f-9480-4bf23eba804c.filesusr.com/ugd/9564ad_6cfda763fe304fdd80295240e9fc5369.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/shadowrun_fillable_character_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/253cbe25-37f6-4390-9fd0-5fd5848bdfa2/what_peoples_choice_award_did_maddie_win.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/29274615589.pdfIn PDF document text
    • https://19a4122d-28db-4ec2-a9e3-8c1e87f24dd5.filesusr.com/ugd/70d0b7_0944db4b3a5649aabff3d994718f2a32.pdf?index=trueIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_c5ff622e5e7b43b0957b6b8905908060.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/26640468712.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013302.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13302 17748 bytes
SHA-256: 5df4012a3869333f4f6c2053e958f2dc01473889f1e67633fc719d81413743ed
font_00_sfnt_off0000fa92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA92 4968 bytes
SHA-256: 92d06296a9111071527c66f761cf8d1d57389112ceeb947d4d4ef47f0199f328
font_01_sfnt_off00010b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8C 11976 bytes
SHA-256: 7ebd90638a7a6f9fec952ad6f5fff03d7374a8eb35f397c288a5a39c71e60f5b