Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58a3f8c51f7b7e0…

MALICIOUS

PDF

81.9 KB Created: 2021-03-25 13:49:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f2e5822e517e0fdb3a239f390b08e104 SHA-1: 59f25a589332eb2b972e9dff6750fe32fd2cfe3e SHA-256: f58a3f8c51f7b7e09d42c3f0794359f57f3be704bc7fffb0b45c74163484665b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=differences+between+the+100+books+and+show PDF link annotation
    • https://cdn.sqhk.co/zipuzedozame/iilgehb/master_graffiti_artists_almost_always.pdfIn PDF document text
    • https://cdn.sqhk.co/ranuvore/apgcjcy/ant_radio_station.pdfIn PDF document text
    • https://gabodubelekopo.weebly.com/uploads/1/3/4/3/134356924/60aaaa0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425912/normal_5fd1176b05deb.pdfIn PDF document text
    • https://cdn.sqhk.co/tovitaxani/hcjgjcn/sap_fiori_app_my_time_events.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422918/normal_5fc98f4019ea1.pdfIn PDF document text
    • https://jabasamivesapev.weebly.com/uploads/1/3/4/0/134041177/novifazofoki-nojufutobemi-nigixuxebozati.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/6fe25d0.pdfIn PDF document text
    • http://xexuxobofagidad.22web.org/zaleruxotikofuzotipogi.pdfIn PDF document text
    • https://rigavimiba.weebly.com/uploads/1/3/0/8/130814992/gadulew.pdfIn PDF document text
    • https://zejuvuvegodefi.weebly.com/uploads/1/3/1/4/131453892/sobufifezem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_6041759895c0d.pdfIn PDF document text
    • https://cdn.sqhk.co/leluforeref/cZgdJb1/40205175418.pdfIn PDF document text
    • https://cdn.sqhk.co/saligoliti/gehcSgj/12332_zig_zag_way_tustin_ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_6043282447e34311b143551557cea89a.pdf?index=trueIn PDF document text
    • http://rixupod.rf.gd/4698051075.pdfIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_81a1732388dc4c6aa11c9908211afc4e.pdf?index=trueIn PDF document text
    • http://fipinajamidab.epizy.com/free_antivirus_for_windows_7_avg.pdfIn PDF document text
    • http://mogejizezapeb.epizy.com/8086_microprocessor_bharat_acharya.pdfIn PDF document text
    • http://zenijesadimikig.rf.gd/vefupobusa.pdfIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_355105e21cc343069770fd764f6dd5e4.pdf?index=trueIn PDF document text
    • http://kataribijinezej.epizy.com/93636241029.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_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 5568 bytes
SHA-256: e9d94777531e5f5ae70d64091e4a5514dc2bc41a1b256b5b97f8926671ecb832
font_01_sfnt_off0001159d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159D 10640 bytes
SHA-256: 0335c781c19aa8d4c7a2d9067d9a29f6c315533706a3fe390f6ae788f76b48b4