Malicious PDF — malware analysis report

Static analysis result for SHA-256 130aa104ee4c9523…

MALICIOUS

PDF

93.1 KB Created: 2021-05-07 02:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dc3bbf7d23b74c13f77e4b8077f851da SHA-1: fa07d193139cbb7f250df74bf094193b3225f722 SHA-256: 130aa104ee4c9523f8fa3369df7d65f73073ac0b4c0fda7f841ce37efce997a0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://seumenha.ru/strik?utm_term=when+is+fifty+shades+darker+on+netflix+uk+2020 PDF link annotation
    • https://cdn.sqhk.co/vefasebo/bjaNihc/56753175331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446937/normal_605bb1e7074b0.pdfIn PDF document text
    • http://zexaribamemavi.sportsontheweb.net/lenovo_thinkpad_t430_i5_16gb_ram.pdfIn PDF document text
    • https://cdn.sqhk.co/vibefoparo/XAHjhjE/36406413656.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/iNS2doi/age_of_empires_2_multiplayer_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/mafulavet/3hf3gh7/nostalgia_electrics_cotton_candy_machine_instructions.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/autocad_to_converter_software_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372086/normal_60419a95e5f85.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/rebisokowabe.pdfIn PDF document text
    • https://cdn.sqhk.co/gopilufifeda/jbgfhi5/riwep.pdfIn PDF document text
    • https://cdn.sqhk.co/mezugifosa/hcVZxhe/lijurexuxonafaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_60322cb538845.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/jgJiiah/48816851413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383471/normal_604b86b8717c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_843940cad85049e6849c5bd291711452.pdf?index=trueIn PDF document text
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_9879c699bc034d1b9c4ef62a65515c76.pdf?index=trueIn PDF document text
    • http://tenezozujilajiw.rf.gd/android_sqlite_database_tutorial.pdfIn PDF document text
    • http://junulobexatini.rf.gd/guzumilexa.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_off00012d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D15 5516 bytes
SHA-256: 4e9620b2f3c0933f435a520d2bff243b10332dbc3fec777bf5a8fdfa14f06087
font_01_sfnt_off00013fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE7 11520 bytes
SHA-256: 46d973d5ca4c425683d3d28dea714a2ab9da006153fb506e52f722e10ba271e1

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