Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa92bc0c857d28b5…

MALICIOUS

PDF

79.2 KB Created: 2021-05-24 05:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 33dc8c1dd57a35636ebcbfab08ff2689 SHA-1: ee8b4f83375fdd2a02202a173e04b5b15222c9b4 SHA-256: aa92bc0c857d28b5d36720a72c801f71c0a27fd9c62b48e6952673086c34ffc1
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, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains text related to a book title, likely used as a lure. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection and ML flagging, strongly indicates malicious intent. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/strik?utm_term=cryptography+and+network+security+principles+and+practice+8th+edition PDF link annotation
    • https://pelunukemuf.weebly.com/uploads/1/3/0/7/130776607/7b6ff0ab2cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418566/normal_604eb0c230474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450635/normal_60445f06c2bbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486041/normal_5fc98e702f42e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379961/normal_6056f6ba15c06.pdfIn PDF document text
    • https://fanejutasoja.weebly.com/uploads/1/3/5/3/135399707/7f025.pdfIn PDF document text
    • https://lofidebonejiniz.weebly.com/uploads/1/3/5/3/135334880/pupafeketetesujen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497685/normal_600d4b95b94b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459478/normal_5fdc7e5a5851e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489724/normal_5fcd0fc3dd1e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413590/normal_604e75ebeaa37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465015/normal_5fc883e885594.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/desugazepixepu_titaz.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/4695bdbb-73e4-46ec-8ff5-8469a23e6cd3/35813172882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c729b2b6-04d1-4860-bb72-cc5cb429307f/rangers_apprentice_movie_release_date_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a6dbbba-bffc-4f44-8f09-4648d171c928/27083756915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f348e983-6237-4bcf-8d6b-ef82e1c200de/61947434214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/859ca8ea-9832-4249-8177-93e209de621d/berefefewiwuzerekufiroled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96645939-1d8a-4d16-be47-276162918e92/paradise_lost_book_3_line_by_line_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a639d23e-82b5-4972-a603-9a704aa60820/wixisuje.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/30093715783.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/sweep_picking_tips_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/965c0c7d-e01c-4bd5-9b2f-34f95262f343/como_fazer_tabela_nutricional.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/mukawo.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_off0000f586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 5692 bytes
SHA-256: 0e50a94b9c19606d3bb4c64f31123c295801a1515efd091eac6da2c714d564b0
font_01_sfnt_off000108fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FA 11016 bytes
SHA-256: c47cb47bfa163265d9ec82c56eeb1bf1355d4780c6300669bdc5888dc8a2a92b

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