Malicious PDF — malware analysis report

Static analysis result for SHA-256 73349975868e253d…

MALICIOUS

PDF

78.6 KB Created: 2021-04-04 23:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b5a4f74838cddedbf65779304a36bb28 SHA-1: 2320e7ae730659a70f1b0f425781d6985cca9eb0 SHA-256: 73349975868e253dc438a94707d5a052dbf1c323982f0f167a971fa009ad97f4
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-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://dafemum.ru/award?keyword=barbarians+at+the+gate+bryan+burrough+pdf PDF link annotation
    • https://cdn.sqhk.co/feletitami/Kjfgeid/gem_hunt_tv_show_fake.pdfIn PDF document text
    • http://gilutij.iblogger.org/ben_10_alien_race.pdfIn PDF document text
    • http://wemepena.iblogger.org/linear_and_radial_heat_conduction_lab_report.pdfIn PDF document text
    • https://cdn.sqhk.co/sixojifez/iighjfn/juicy_fruit_commercial_1984.pdfIn PDF document text
    • http://termometr-medikal.site/95454469982idtw1.pdfIn PDF document text
    • https://cdn.sqhk.co/medijamowole/VvihjdM/download_apk_sniper_strike_blood_killer.pdfIn PDF document text
    • http://copyright-supporthelp.com/jufaserejadumut6nqy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_c0e3813251b24c8ab0b26e61a62955f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6d60468-18e0-4f13-b255-0ba4966adc83/29479694534.pdfIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_c964e0d2859e41ee8fbd3abc9af3684a.pdf?index=trueIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_2ec70b2cff4a41f3a0af97f24d6fb10f.pdf?index=trueIn PDF document text
    • http://pawegafed.rf.gd/fotamowabudima.pdfIn PDF document text
    • http://pimorem.epizy.com/nikon_coolpix_p520_review.pdfIn PDF document text
    • http://zifawikixeliba.epizy.com/graduation_invitation_templates_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1004eca8-9b0a-45d7-bfc4-4465847a9729/aleppo_codex.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_0e88e1f65f6c4c32b4f918127c3409f9.pdf?index=trueIn PDF document text
    • http://madulok.epizy.com/gizawukawisirugedona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6d2d61f-408d-4b93-b1c9-b3e4acd032ee/staples_one-touch_stapler_60_sheets_user_manual.pdfIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_453cd80670f144b0bb0c976d5b7f3aee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0579fec-deea-46af-b555-8b5553575677/vozulenepigab.pdfIn PDF document text
    • http://jegowijuvu.epizy.com/saira_narasimha_reddy_teaser.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_off0000f2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 5564 bytes
SHA-256: 4821d62008dcdcf08d6d3f3f1e6dc3bd934c20a1f68efb41554bda340476bc0b
font_01_sfnt_off000105ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AD 11520 bytes
SHA-256: 31eeccb180cb8f188cac4e76a0e46c64ccf3ddc5b31dc7949bd036b66e87a0d6

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