Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a0b21b7a545aaf…

MALICIOUS

PDF

79.5 KB Created: 2021-05-28 16:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d7c52dcb66d2f96929eabb3fc1df52cb SHA-1: c2658009761c45e0a42e1fb71133bf7013c87fc3 SHA-256: 64a0b21b7a545aaf76f87bcdae69ef99ce3a5921c2ed49906e6453de6200b967
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://maypoin.ru/strik?utm_term=what+is+the+moral+of+the+gift+of+magi PDF link annotation
    • https://diwuxofemuji.weebly.com/uploads/1/3/1/4/131407179/tapopinuzo_jonafebutejawut_wabadagupivuzo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369788/normal_5ff666d0873a1.pdfIn PDF document text
    • https://sutopudebesi.weebly.com/uploads/1/3/1/4/131438093/39461233abc0c1.pdfIn PDF document text
    • https://mojisavavuke.weebly.com/uploads/1/3/5/3/135312470/852082.pdfIn PDF document text
    • https://poroxokinawutaj.weebly.com/uploads/1/3/4/5/134507376/7341449.pdfIn PDF document text
    • https://razixolinatu.weebly.com/uploads/1/3/4/3/134384461/tijewujulebir.pdfIn PDF document text
    • https://koxamuru.weebly.com/uploads/1/3/4/8/134890845/8647209.pdfIn PDF document text
    • https://tajurasexir.weebly.com/uploads/1/3/1/6/131606020/difaxusezuvo.pdfIn PDF document text
    • https://jubezotezuwu.weebly.com/uploads/1/3/4/4/134476040/milera.pdfIn PDF document text
    • https://bopazexujow.weebly.com/uploads/1/3/4/8/134876268/5371990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387698/normal_6010b221d5533.pdfIn PDF document text
    • https://bajusokizuz.weebly.com/uploads/1/3/4/4/134400974/3f93b77.pdfIn PDF document text
    • https://debimagobu.weebly.com/uploads/1/3/1/6/131637583/0e2e8a7.pdfIn PDF document text
    • https://bozetefaz.weebly.com/uploads/1/3/4/7/134733050/pobitokivoripux_wuvunujurutopiz_jabudewe.pdfIn PDF document text
    • https://xoselobukakuri.weebly.com/uploads/1/3/4/4/134498653/9366292.pdfIn PDF document text
    • https://vetedikagumon.weebly.com/uploads/1/3/1/4/131453784/newudebojupi.pdfIn PDF document text
    • https://xurarasetar.weebly.com/uploads/1/3/4/0/134096945/maxigo.pdfIn PDF document text
    • https://wuwivuwo.weebly.com/uploads/1/3/7/5/137504369/d4f8ef45dabd3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366348/normal_5fd04bb122fcf.pdfIn PDF document text
    • https://vozumovoso.weebly.com/uploads/1/3/4/5/134506012/779664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469643/normal_606350f01d06a.pdfIn PDF document text
    • https://revelamedif.weebly.com/uploads/1/3/1/4/131437508/newoxebufuja_kutax_donororeliperis.pdfIn PDF document text
    • https://xibigulekin.weebly.com/uploads/1/3/0/9/130968960/92b31d.pdfIn PDF document text
    • https://wuguxobexo.weebly.com/uploads/1/3/0/7/130739488/c8108a27b.pdfIn PDF document text
    • https://pipanemedu.weebly.com/uploads/1/3/7/5/137505834/vopakibasegorok-rorovuzalozev-nazirokegu.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
    • 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_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 4876 bytes
SHA-256: ff2a35257f17935a67effc78299b67d3a2afdf00b99b9c208b9ab65b8e7aafd7
font_01_sfnt_off0000fb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB57 10784 bytes
SHA-256: 486378ab4a0c3a3cdc605842e9e20f19f86e8141e30471509eb3cbd3a1f3655a
font_02_sfnt_off0001204f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f