Malicious PDF — malware analysis report

Static analysis result for SHA-256 9820ec177823a8b4…

MALICIOUS

PDF

101.1 KB Created: 2021-05-22 05:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7aedee82c0e50789aeec6872b5de8b82 SHA-1: 24ed78460bbf668222c080702d9b249f84337749 SHA-256: 9820ec177823a8b435c159fd325c51beea875e7e2f1e278ec314485e10b7f7dd
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The primary purpose appears to be directing users to external content, potentially for phishing or malware distribution, rather than delivering a direct payload within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://soxebez.ru/strik?utm_term=novena+de+navidad+2020+colombia+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425230/normal_601eedd000616.pdfIn PDF document text
    • https://wujatukeki.weebly.com/uploads/1/3/1/8/131856991/8205158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488574/normal_60599c3f5c401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402478/normal_604d01422b5c4.pdfIn PDF document text
    • https://rifidikebipe.weebly.com/uploads/1/3/0/9/130969129/navamag.pdfIn PDF document text
    • https://sevenunoxesu.weebly.com/uploads/1/3/4/3/134341304/164d0b9e326088d.pdfIn PDF document text
    • https://rowegodidevonu.weebly.com/uploads/1/3/4/4/134468430/a3fb76f70.pdfIn PDF document text
    • https://rofikilidoxomuk.weebly.com/uploads/1/3/4/0/134017179/sameniru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402932/normal_604dbf9a092a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486535/normal_5ff766520cde1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384470/normal_600fc183314c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403960/normal_60403df37372e.pdfIn PDF document text
    • https://kikuramem.weebly.com/uploads/1/3/2/7/132740701/c900b922b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388819/normal_6017dba8e8b57.pdfIn PDF document text
    • https://pedexanagokol.weebly.com/uploads/1/3/4/6/134635549/20d13f21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392191/normal_60295a85c5e22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469350/normal_605f4b71d0e7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477147/normal_606306e776117.pdfIn PDF document text
    • https://ganubidorebe.weebly.com/uploads/1/3/2/7/132740923/letanokepapal-soreg-ziwizoso.pdfIn PDF document text
    • https://vexixizeled.weebly.com/uploads/1/3/1/3/131384380/53414c39e6f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408336/normal_6043e585bfcd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401973/normal_6008f179e332b.pdfIn PDF document text
    • https://kalizijowu.weebly.com/uploads/1/3/4/7/134733304/sirifiraforuwos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1f60bbf2-4758-4fdd-b8b4-4562853b3a7f/dogagiseter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f0dcaa8-23e1-4f09-b86a-c2a7809030d7/how_to_setup_epson_printer_wf_2630.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59470489-cef9-4ca6-b4f2-7ac8262b076d/valoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4514332-1817-4821-89eb-58f209473ff7/60169214199.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D67 5180 bytes
SHA-256: 6b5477a82cc0e03485e7b9f40a371579ef372e069bf23cbe14e5da79d2603f62
font_01_sfnt_off00014ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF2 12388 bytes
SHA-256: f3f48d48a17d51b8e45a6e1729b42fb97907296e09971497a9757a750985edea
font_02_sfnt_off000176d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176D2 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2