Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76108f1668bac64…

MALICIOUS

PDF

76.7 KB Created: 2021-03-17 03:55:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6e809e7aefd4652904c130940da3228e SHA-1: 925dad5b06922ab8d81a77ec0f358242cd8f5c23 SHA-256: a76108f1668bac64724bf28cc67978b64a4659862b49c4efb0d45fede3261c2e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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/wix?keyword=whatsapp+plus+apk+2018+ultima+version+uptodown PDF link annotation
    • http://rasipafus.getenjoyment.net/nordictrack_commercial_2450_treadmill_price.pdfIn PDF document text
    • http://ravevuzovije.mywebcommunity.org/91866586355.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/16134953806.pdfIn PDF document text
    • http://nowefewafugaki.iblogger.org/cisa_study_guide_2017_free.pdfIn PDF document text
    • http://fafabil.getenjoyment.net/wuvegiw.pdfIn PDF document text
    • http://zijaditenup.getenjoyment.net/60309191494.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://powajokex.rf.gd/hiperplasia_benigna_prostatica.pdfIn PDF document text
    • http://gidubabe.myartsonline.com/automation_studio_6._0_manual.pdfIn PDF document text
    • http://pejabefi.rf.gd/24273449327.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/amortisation_formation_expenses.pdfIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_f883a6665081462db74a018226ff2ba5.pdf?index=trueIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_0a11be2640c24ce3b6138746c0a50e9e.pdf?index=trueIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_91c3f205009a427dbadaac668fd118db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/474bef0b-1b07-4654-8bfc-cdb3cc153de1/67624090512.pdfIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_6b4c9ffffc62446b8253056636ac66eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/06dedef4-4812-4160-83dc-27bae01f9803/29860524641.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/african_swine_fever_tagalog_information.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/8096469004.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_off0000ec2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2C 5948 bytes
SHA-256: 45c0641855d760291ec2eea509059d7c71a7451fbf2407100c6d7bdb2fb2c8af
font_01_sfnt_off0001005d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 10784 bytes
SHA-256: f467b123af75c4380ea306b8649a706d86dc13f2528a03e036b4126d4e7bb7c1

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