Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16ca6d1dd612500…

MALICIOUS

PDF

95.4 KB Created: 2021-04-09 08:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: de2eda0b2e5d693403d2ed9fd8ba536b SHA-1: b331213f70945feb7576c21e3a8045c2144b0113 SHA-256: c16ca6d1dd6125007321aac44da5c3460c9d2b6477053bc886c39cf4271a961e
126 Risk Score

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://bologen.ru/strik?utm_term=apollo+twin+mk2+vs+twin+x PDF link annotation
    • http://mydenverneighborhoods.com/62849018529zxazq.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/ghjZggc/31837532361.pdfIn PDF document text
    • http://reestr.site/comtrend_ar-5381u_setupjola0.pdfIn PDF document text
    • https://cdn.sqhk.co/vefobinibe/jgggDSs/blackberry_work_for_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/cifidjf/88749149549.pdfIn PDF document text
    • http://sefegusekepuxa.mypressonline.com/stress_assessment_scale_for_adolescent.pdfIn PDF document text
    • https://cdn.sqhk.co/zesokepewami/jhjbPSJ/geometry_standardized_test_practice_workbook_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/delotijuw/cZPjfgf/mizozamamifejul.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/qnhbjgn/84704846461.pdfIn PDF document text
    • http://lokotahas.ru/what_chain_oil_for_milwaukee_chainsaw4xap3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sitok/nerisikopupelesubugiped.pdfIn PDF document text
    • http://numumodi.epizy.com/audit_methodology.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/kindergarten_math_worksheets_addition_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/the_complete_manual_of_suicide_english_buy.pdfIn PDF document text
    • http://wezegene.rf.gd/arsene_lupin_gentleman_thief.pdfIn PDF document text
    • http://tevetozenirok.rf.gd/allen_test_series_for_neet_2020_schedule.pdfIn PDF document text
    • http://nufulavidibime.myartsonline.com/66667185143.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/aap_ka_suroor_song_320kbps.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F66 5064 bytes
SHA-256: 227ec541f8c6ac99fba729716985936de412da6775b7ca4af02c707344a9cd67
font_01_sfnt_off000130b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B0 13064 bytes
SHA-256: cb9acba5dac66cc3f3e39393a104cc6a10404f595acacd7dd4943bcd7677e7ea
font_02_sfnt_off00015b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B5B 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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