Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da00f639ce69615…

MALICIOUS

PDF

76.2 KB Created: 2021-04-16 20:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6e3f59e3d460a7bc906b253ce4203f80 SHA-1: bda18145b8890e81f1b37205f5319244914f62a0 SHA-256: 5da00f639ce6961560fa9a6d052eb7aa0a6797fe312f930ea302cec17b0488f4
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+can+i+start+keto+diet PDF link annotation
    • https://cdn.sqhk.co/ketejeti/JieqjaW/71313001798.pdfIn PDF document text
    • http://sutezesibopixiv.medianewsonline.com/warranted_christian_belief.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/gjhgjc6/class_7th_science_ncert_solution_chapter_1.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/miller_syncrowave_300_tig_welder_manual.pdfIn PDF document text
    • http://mepamoso.sportsontheweb.net/mixtures_and_alligation_problems.pdfIn PDF document text
    • http://kudukudimox.sportsontheweb.net/39786780702.pdfIn PDF document text
    • http://vatidenow.medianewsonline.com/uncle_tom_s_cabin_test.pdfIn PDF document text
    • https://cdn.sqhk.co/temazajilib/hj7Ddib/94087430367.pdfIn PDF document text
    • https://vojawozusuv.weebly.com/uploads/1/3/1/1/131164351/sowiwaburef.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/hdgfVha/26567207317.pdfIn PDF document text
    • https://pogusunuj.weebly.com/uploads/1/3/4/8/134874329/7821392.pdfIn PDF document text
    • https://lugilalosu.weebly.com/uploads/1/3/4/3/134314137/tezufusipet.pdfIn PDF document text
    • http://jupofara.22web.org/8808358582.pdfIn PDF document text
    • http://daxuzenadisasib.iblogger.org/vixawaxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wutivufugisev.epizy.com/short_tricks_for_aptitude_questions.pdfIn PDF document text
    • http://mujebik.atwebpages.com/jevudakaliredemut.pdfIn PDF document text
    • http://vezenupu.epizy.com/fejebidal.pdfIn PDF document text
    • http://litiwevapebani.epizy.com/distributed_generation_seminar_report.pdfIn PDF document text
    • http://lufopudizomuv.atwebpages.com/gibabakubikusujar.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_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 5016 bytes
SHA-256: 3afb9774039cf1217f505600a6bc855e2839718a1fc0cd5117d2e8f70a5fab82
font_01_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 10880 bytes
SHA-256: 7b96a1e3ce7c728b2a193f23f6cd40a6baf25edf40988dee63e7fa608f3aa2fb

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