Malicious PDF — malware analysis report

Static analysis result for SHA-256 7735ec408b852a65…

MALICIOUS

PDF

84.9 KB Created: 2021-05-21 12:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9e5a11f44c143cc9f2e5ffee4fc5ac09 SHA-1: 746ea06c32ae00e53ad5e05cb6981e7e6c7db83d SHA-256: 7735ec408b852a654c2b30e86b570ef968c22f6a84bcbe49de2e54da0ce75513
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, including a suspicious one on 'golowaki.ru'. The document's structure and embedded links suggest it is part of an SEO spam campaign or a phishing attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/strik?utm_term=how+fast+upload+speed+do+i+need+for+zoom PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476946/normal_606cb2dde75d9.pdfIn PDF document text
    • https://zufezegudowoz.weebly.com/uploads/1/3/2/6/132683286/rotujadevinomo.pdfIn PDF document text
    • https://folobuwula.weebly.com/uploads/1/3/4/3/134374444/d93a13be0c8037f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422163/normal_604d88f3a9848.pdfIn PDF document text
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/mepuben.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476757/normal_5ffc533f4d824.pdfIn PDF document text
    • https://ganakinupep.weebly.com/uploads/1/3/4/5/134599301/3342566.pdfIn PDF document text
    • https://solawelosadi.weebly.com/uploads/1/3/1/8/131857655/0e353d1a92b.pdfIn PDF document text
    • https://vuxuminitemup.weebly.com/uploads/1/3/0/8/130874085/bifegiboveduxeram.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449779/normal_5ff381c496dab.pdfIn PDF document text
    • https://putoluvutawubu.weebly.com/uploads/1/3/1/4/131437806/xuwajul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528780/normal_606bbd80532ad.pdfIn PDF document text
    • https://nutiduvurenomal.weebly.com/uploads/1/3/4/6/134681926/8940408.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/3e29bee9-ab56-46f3-8995-81ef25782aa3/versiones_de_la_biblia_on_line_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8e6b210-0d97-42e0-9da1-8e3156722d20/how_to_do_arm_exercises_with_resistance_bands.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/journal_voucher_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c77d2215-4e1e-41aa-a554-5c317c513866/news_of_the_world_movie_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d33814c2-a8d0-433c-9df5-91e9647cf9da/lupipov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11a3d0ee-3e29-46dd-b141-7cfdd1be2cd0/kugaputaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43ff3c7d-d5aa-48ae-a90d-32d8a3b024e7/sivapavutodopexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd10c127-4aef-40d8-84f9-389ce9798d61/96904075277.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/98515063302.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_off00010cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAE 5292 bytes
SHA-256: bc876d35fe5d7cb540276e992f6fe275481696eb3a994ff3fdace45c2943fe77
font_01_sfnt_off00011eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB0 11720 bytes
SHA-256: ca638adcc117ed302b647350efde786d6f20eed47c0c9784d3c2bfd0aae443d1