Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac2758f48d16961…

MALICIOUS

PDF

76.6 KB Created: 2021-04-28 21:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3cb7dce01fdd3d1490e8d679017b175a SHA-1: 1f40df3363fb0e46fb5f96e2bab5c5069536b4f7 SHA-256: 4ac2758f48d16961b49252fe395acab28e82b1bcc83d9de75b83dc11752d0948
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 0.9997

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/strik?utm_term=where+can+i+buy+a+keto+diet+book PDF link annotation
    • http://sethel.xyz/do_i_need_to_lubricate_my_nordictrack_treadmilloacsp.pdfIn PDF document text
    • http://unosital.space/ffa_creed_challenge_crossword_answersdseqn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497346/normal_6032bba013d40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473023/normal_602ae53e02645.pdfIn PDF document text
    • http://trixy-matrix.space/14632517114izwft.pdfIn PDF document text
    • http://newyearshop.site/un_puente_hacia_terabithia_trailerv1trx.pdfIn PDF document text
    • http://alisaborodaenko.design/trial_by_fire_book4px17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465537/normal_60243a0735bbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_5da4759ea2bb4369bbe2b49f08840c80.pdf?index=trueIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_a84e2ef40c8141aeae2b5f5b7ad2070d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8aa9ff5-bb4f-4201-9d57-b0fdd0f3ce39/light_reader_free_books_and_novels_apk.pdfIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_704b5ff19ac544259b23116fa89908b1.pdf?index=trueIn PDF document text
    • http://latisikonif.epizy.com/12814145416.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/niguxukujuzupoxesokisukom.pdfIn PDF document text
    • http://wozaxanakix.epizy.com/kalender_2019_indonesia.pdfIn PDF document text
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_da9561e46d9f4beab5a760fcf33cfb22.pdf?index=trueIn PDF document text
    • http://dedafozun.rf.gd/objective_c_manual_reference_counting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ac9c5ec-15b3-4af9-bfa8-c03dc61f04b2/98509798879.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/tugutevikalage.pdfIn PDF document text
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_75fb2bdcf46c420c995ec5b39f273cc8.pdf?index=trueIn 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_off0000ecf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 5136 bytes
SHA-256: a86e13db751b12ea82256169897e7f17daac409908383628fb3ae458692bd542
font_01_sfnt_off0000fe74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE74 10864 bytes
SHA-256: 0f8c11e4304609312df99333035a89974ad1f17a10a9410c661a7d71d61466ed

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