Malicious PDF — malware analysis report

Static analysis result for SHA-256 606d9a807d3c0183…

MALICIOUS

PDF

75.8 KB Created: 2021-05-30 06:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 438101c03efc47e407d8f9723ffbf3c9 SHA-1: ea107babb3e397a6cc47961bfc56cb6fc470b48e SHA-256: 606d9a807d3c0183176ab57eb22e4126b5caaec3ead86222ba367fa10ef095d2
206 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The primary malicious URL identified is https://pelibifir.ru/strik?utm_term=division+de+2+cifras+con+prueba, which likely serves as a phishing or malware distribution endpoint.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://pelibifir.ru/strik?utm_term=division+de+2+cifras+con+prueba PDF link annotation
    • https://rulodewarozuw.weebly.com/uploads/1/3/4/6/134678260/91159a.pdfIn PDF document text
    • https://xaguverage.weebly.com/uploads/1/3/7/5/137513239/8718371.pdfIn PDF document text
    • https://dibikavo.weebly.com/uploads/1/3/0/7/130738915/5511724.pdfIn PDF document text
    • https://kaxobemux.weebly.com/uploads/1/3/4/6/134676595/vabovo.pdfIn PDF document text
    • https://gegizadewer.weebly.com/uploads/1/3/1/4/131482997/xufup.pdfIn PDF document text
    • https://pibulibeles.weebly.com/uploads/1/3/5/3/135324177/3766797.pdfIn PDF document text
    • https://zulusoneruw.weebly.com/uploads/1/3/4/8/134887175/5690107.pdfIn PDF document text
    • https://depesusexufajev.weebly.com/uploads/1/3/5/3/135351117/xijujevokaruxil_pujefunuz.pdfIn PDF document text
    • https://sitasujo.weebly.com/uploads/1/3/4/8/134876827/13171dd32627.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/2ab30444-b0e9-4e09-aa16-246059de9e1e/dark_knight_joker_quotes_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ab92963-5fea-4485-8de5-80b694d53a22/tonewamegaboxisoxeke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9a57983-b42b-4bd8-8619-bd87b054e51e/derewopizapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1213ab2-2fc8-4fdb-9591-616143b3c3e3/43109340138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11d059ba-f6aa-4483-abfc-61379e415a4c/53996203559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e39ef6ee-9408-4122-ac93-1705462dce18/que_es_una_propuesta_de_valor_en_una_idea_de_negocio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29754387-33e2-4d8a-b683-c368af35d6e9/desulaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/644bb8c6-d620-46a6-b2c6-b890bb5d72f1/how_do_i_fix_the_oe_code_on_my_kenmore_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99cf946b-a733-4340-aa47-dcf741bfdd21/tedosonanusaveja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa29070b-2ecc-4d4a-a3a4-cf43328bc12f/tazosudomorolamiwotaxoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ef00daa-56ba-4269-a8ae-38b74d9dd71f/makugoxifajejesijupo.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_off0000e636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE636 5448 bytes
SHA-256: 48a70b0214b2630ee67c7d2ddc9a2a18f6eac8d2542953be85cec5f42473cba1
font_01_sfnt_off0000f8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DB 12140 bytes
SHA-256: c2bed2529f8e18787bf3a0fbcb00d69fb1348f690772e965c31900bc1168644b

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