Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d245a941cb1157…

MALICIOUS

PDF

74.9 KB Created: 2021-06-08 20:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 91aeae7b4c5ab513043d02780655036c SHA-1: 9cf4d04ef08995a0fa3e493eec5547f1f9dcee5d SHA-256: d8d245a941cb115765c378658474d79108c83d2f13d5ab3f8d7d1c2f17c11c47
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/pbw?utm_term=mind+games+pro+mod+apk PDF link annotation
    • https://wutotopuwa.weebly.com/uploads/1/3/4/4/134464713/sadiwogu-zojudefu-jofizamipufe-senirakum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417806/normal_6028658a89fb3.pdfIn PDF document text
    • https://vobokalonumenu.weebly.com/uploads/1/3/4/6/134656332/kujixopulidabapetus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464700/normal_60505900801ae.pdfIn PDF document text
    • https://kusonanozeko.weebly.com/uploads/1/3/0/7/130775507/loroxelar.pdfIn PDF document text
    • https://gobibozuvabi.weebly.com/uploads/1/3/4/6/134683572/jowojuxodikinuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485580/normal_601b9f034a69d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369182/normal_60001bcbaa96a.pdfIn PDF document text
    • https://giwonogudere.weebly.com/uploads/1/3/4/8/134872327/dc7b89aa5cb5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451551/normal_5ffaefb68e077.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427091/normal_60333a190d3b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446285/normal_60185d6322498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528915/normal_60242a7554c77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_60111f64053bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lufokomarib.pbworks.com/f/zopatinexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0516769e-4ef8-4c59-a483-9ea60ad810a7/bulaj.pdfIn PDF document text
    • http://vazesuna.pbworks.com/w/file/fetch/144506289/96824147205.pdfIn PDF document text
    • http://vejivab.pbworks.com/w/file/fetch/144633885/acc_aha_blood_pressure_guidelines_2019.pdfIn PDF document text
    • http://zekodunu.pbworks.com/f/fatisekogedadodofiwevuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79f42de3-5ab9-41fe-821c-8dfa37115eb5/80060979641.pdfIn PDF document text
    • http://gesugot.pbworks.com/w/file/fetch/144861042/21848019279.pdfIn PDF document text
    • http://negipidini.pbworks.com/f/how_to_crochet_magic_circle_uk.pdfIn PDF document text
    • http://kekirow.pbworks.com/w/file/fetch/144714372/how_to_open_swingline_stapler_2_40_sheets.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_off0000e69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69F 5316 bytes
SHA-256: fa87a2df7030109187a2ae59d4fc0928d1a6fbfcf3d99c9cc28bb3a118dbce10
font_01_sfnt_off0000f8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B0 11032 bytes
SHA-256: 56f98679f1076625177a21bc43b584537124735109d63f366d3ef206ccb33ef6