Malicious PDF — malware analysis report

Static analysis result for SHA-256 87237eab0a6adc93…

MALICIOUS

PDF

76.3 KB Created: 2021-03-28 02:51:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 64ca627ae7fad64a9eb3be6840328fb4 SHA-1: 5090356e929dfa5f4befaeef02d492aaaf438dbe SHA-256: 87237eab0a6adc93a61f2220923c0d6c009b95c64ebf272bf1147ff886da0099
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-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://jottigo.ru/award?keyword=learn+english+beginner+level+1+pdf PDF link annotation
    • http://health2health.online/xogemixenugopaxikutolty12u.pdfIn PDF document text
    • http://ezfix.asia/how_to_fix_not_detected_flash_drivenoz7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483833/normal_5ff07a288ac30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426945/normal_6021d44ec0702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391620/normal_6029cc80f3938.pdfIn PDF document text
    • http://temilops.xyz/davopgztjn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fowasabitafal.epizy.com/jomakelisapupitaroseran.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/978622b2-7cd7-4dfc-a3be-8efd91af15c3/ralugumogesewimelifetuki.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/yahoo_finance_data_in_r.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/surebotujovetume.pdfIn PDF document text
    • http://vigevelo.rf.gd/barron_s_essential_words_for_ielts_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/frequency_table_worksheet_grade_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7350bd8c-4489-461e-8002-88d26d411284/puwoxosolexunajezevesaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3371e1a0-1d61-431f-8395-04cf0cadacac/15205054695.pdfIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_703fa8ff84814b73a39b05a99577441f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/famubipajepagamuxof.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_7cea6e7b62ac411ab4e257e56e88d0b4.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_off0000ee30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 5496 bytes
SHA-256: 698d98ce105d9efcdb4f86e6e7c9e4c8063fecc978b0e45250622eeabe69c220
font_01_sfnt_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 10448 bytes
SHA-256: 3725c7048d5f6904989f3a1e882c072741160d3b2a5ee1d420efc4cb34db3826

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