Malicious PDF — malware analysis report

Static analysis result for SHA-256 844fb57e566907cd…

MALICIOUS

PDF

83.0 KB Created: 2021-03-23 17:38:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d98b70fd124a59eb7be4dc27307a1663 SHA-1: 8c69982565c4ce0063fcb0549e93adc2fb46e476 SHA-256: 844fb57e566907cd5bdce8ba7247af09b6dd66d653cbf2c7d2ba457d70b3b696
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 0.9993

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://gimoguvi.ru/wix?keyword=chapter+14+study+guide+answers+physics PDF link annotation
    • http://soldatskaya6.ru/minecraft_crafting_guide_book_modzwkqz.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/zekorazerufonasabedafej6xj22.pdfIn PDF document text
    • https://poxanada.weebly.com/uploads/1/3/1/4/131483305/xukivoxojomefiz.pdfIn PDF document text
    • http://it50discount.pro/prefixes_and_suffixesf997o.pdfIn PDF document text
    • https://rijesire.weebly.com/uploads/1/3/0/8/130814070/33d730e760e.pdfIn PDF document text
    • https://lasubapomi.weebly.com/uploads/1/3/0/7/130776640/jewazazag_lipejipopafaz.pdfIn PDF document text
    • http://qiwi-wallet.online/karuppusamy_kuthagaitharar_songs_free_tamil7llg7.pdfIn PDF document text
    • http://sarepoxorak.22web.org/4810726394.pdfIn PDF document text
    • http://retys.space/sharp_objects_cast8aqnh.pdfIn PDF document text
    • http://selozufuwadapuw.66ghz.com/jobimivef.pdfIn PDF document text
    • https://jukovuwivoxufab.weebly.com/uploads/1/3/3/9/133997180/887721.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/meludav/daily_hourly_schedule_template_excel.pdfIn PDF document text
    • http://fibotemirazopo.rf.gd/movipagerowimumoxesov.pdfIn PDF document text
    • http://togipumenotu.epizy.com/apple_picking_coloring_sheets.pdfIn PDF document text
    • http://gafibis.epizy.com/48195950622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8522c0f-5c01-477f-9789-d9050099e5db/85488126626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/744fff8f-4a8c-4ba5-9863-668b7dd38000/rules_for_cribbage_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/rch_croup_clinical_guidelines.pdfIn PDF document text
    • http://pobopujobezov.rf.gd/nonexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5171c28-5e01-4455-b10f-4c822fdbd200/61639961066.pdfIn PDF document text
    • http://lilisav.epizy.com/sole_e25_elliptical_best_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/287d8f59-d99a-49d4-b548-8044c4847342/binomial_theorem_probability_calculator.pdfIn PDF document text
    • http://kipenul.epizy.com/cass_business_school_complete_university_guide.pdfIn PDF document text
    • http://jasebusezazov.rf.gd/apache_tomcat_8_installer.pdfIn PDF document text
    • http://vawojemi.epizy.com/game_dev_tycoon_guide_to_perfect_game.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_off00010669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10669 5540 bytes
SHA-256: 7f1bf19e8240f5c483a9317ee1c94f8ea51087b61b10d41d51dd7eee094afa6d
font_01_sfnt_off0001195c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195C 10828 bytes
SHA-256: 70a7721f4393ad4de476f3def71707bc4ee355a751f7454e8d284a39a3d557b4

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