Malicious PDF — malware analysis report

Static analysis result for SHA-256 916a2eaeb1ede2cc…

MALICIOUS

PDF

73.0 KB Created: 2021-02-22 06:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 33bb09fa3ad10a65da7e14a242cb6fc6 SHA-1: c724afbf79c5fddc45856462a9fb503ec50cc405 SHA-256: 916a2eaeb1ede2ccb4ca4a67a549e3eb65dd385e2cc090a0bacaafa913d99554
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO poisoning attempt. One of the primary external links, 'https://baarspo.ru/strik?utm_term=3+types+of+heat+transfer+and+examples', is likely a lure to a phishing or malware distribution site. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://baarspo.ru/strik?utm_term=3+types+of+heat+transfer+and+examples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416140/normal_601850eea96e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470412/normal_602855349a1ce.pdfIn PDF document text
    • https://lobakazuperowe.weebly.com/uploads/1/3/4/3/134352895/zopewe.pdfIn PDF document text
    • https://majivuwuwu.weebly.com/uploads/1/3/2/6/132683475/2402738.pdfIn PDF document text
    • http://wamikesaximilub.22web.org/30170437825.pdfIn PDF document text
    • https://fafiwopadatomag.weebly.com/uploads/1/3/5/3/135326984/c953a1b5470b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446492/normal_5fd31c651fcf9.pdfIn PDF document text
    • https://litufefanim.weebly.com/uploads/1/3/4/9/134901191/9972872.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411218/normal_5ff8f75c9c609.pdfIn PDF document text
    • https://bujajegufo.weebly.com/uploads/1/3/4/1/134108800/pibafar.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/zetubakuz/53394758503.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/la_cumparsita_guitar_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/grenade_alan_gratz_free.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/76871537464.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/ashampoo_free_software.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/kali_linux_tools_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/wefolomojumesobawomalarun.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/dejivamidogog.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/burnout_society.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/98043677840.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_off0000dee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 5520 bytes
SHA-256: 9802289635be12cdf3832e9f294f492ccd6519b10ed57d67dbad5f8c9849d4ba
font_01_sfnt_off0000f18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 10820 bytes
SHA-256: 37f11513f9897646f3217a49248bc481cc91a0769ce6d3676dc6fffb9fb228ce

Open this report in the interactive analyzer, or submit your own file for analysis.