Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38c462a7a8c61b2…

MALICIOUS

PDF

76.5 KB Created: 2021-03-29 15:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 66082e5058903675bc4f511788337743 SHA-1: 516f828eb255560428ba680480fe5070f775c236 SHA-256: c38c462a7a8c61b24d56116ae160ba451f9ab6ed512e630720bfc2689e1c36b9
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://dafemum.ru/award?keyword=cash+flow+statement+analysis+and+interpretation+pdf PDF link annotation
    • https://cdn.sqhk.co/xakurusuk/hhiwj2d/fantasy_name_generator_male_demon.pdfIn PDF document text
    • http://xtreme-sport.ru/vb.net_tutorial_for_beginners_with_examples_free_downloadhzrm2.pdfIn PDF document text
    • http://easterthjg.com/855047377513xyae.pdfIn PDF document text
    • https://cdn.sqhk.co/rubogomuweme/nhjjihj/jogar_online_roads_of_rome_3_completo.pdfIn PDF document text
    • http://gugalex.iblogger.org/rozuxog.pdfIn PDF document text
    • http://titanovyi-filtr.ru/fireboy_and_watergirl_2_cool_math_games37dl4.pdfIn PDF document text
    • https://dimafivatoputir.weebly.com/uploads/1/3/4/4/134496040/6463686.pdfIn PDF document text
    • https://takigufumugo.weebly.com/uploads/1/3/5/3/135345847/xokupixuseleleteg.pdfIn PDF document text
    • http://jolijivik.scienceontheweb.net/zitavivulisurute.pdfIn PDF document text
    • https://cdn.sqhk.co/sevigexew/iiQlhjF/project_schedule_free_template_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/ggiKgjb/fekoxowakuwimasuva.pdfIn PDF document text
    • https://cdn.sqhk.co/poxedomeke/nPOUajg/ports_minigames_rs3.pdfIn PDF document text
    • http://finansi-7.online/comparing_and_ordering_real_numbers_worksheet_answersfbotz.pdfIn PDF document text
    • http://arthromedshop.xyz/tebemarubologubuxzlmzq.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/renavimulidomefisevijavi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/544297d0-e07d-499f-9903-e27d5dc7f033/los_tipos_de_comunicacin_que_existen_hoy_en_da.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b074ac6-2917-4736-86f9-9a9748df5a98/how_to_use_health_o_meter_digital_scale.pdfIn PDF document text
    • http://nogogesusuwebob.epizy.com/kivej.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5D 5380 bytes
SHA-256: e82723bc0fe5027e051749816984b1cc849adf85c1b0c7ea55a187425161a819
font_01_sfnt_off00010197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 10284 bytes
SHA-256: f2516a1f52bff660e3f17a6a4477af913cdc29e96820f09aef3c4a9ce7191910

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