Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55ca13d36c4f334…

MALICIOUS

PDF

128.7 KB Created: 2021-02-27 10:41:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a5e16d20a836d97b02a319b98186fc5d SHA-1: 66c1ef7aa9186e874092906beae977cd15b11dad SHA-256: a55ca13d36c4f3343252f79510ab7fa548534731c6ee77325dce2ca5b09d3d95
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://dugedepap.ru/aws?utm_term=what+is+hedonistic+theory PDF link annotation
    • https://cdn.sqhk.co/zuwiwejagub/qBjbicP/74088685378.pdfIn PDF document text
    • http://sabeladiwuz.22web.org/85111164918.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/what_does_a_car_wash_include.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417220/normal_5fef5f1aa96e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382412/normal_60133faf118ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473388/normal_6033dfa2d1ef5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404123/normal_5ff55370aba71.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/JbzjfT1/dino_hunter_deadly_shores_pc_online.pdfIn PDF document text
    • http://bedebatosisazov.22web.org/smsf_investment_strategy_template_ato.pdfIn PDF document text
    • http://tebifujokejub.22web.org/infinitive_bare_infinitive_and_gerund_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/runenuti/Kjigcia/green_ninja_year_of_the_frog_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dokamaruxif/l2zggcC/vewilajepilikodawuwogut.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/NghhgZf/sebob.pdfIn PDF document text
    • https://cdn.sqhk.co/wixumenez/gEWOHwV/39319217597.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/mhejaic/lexia_reading_core5_level_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pavemamixazose.rf.gd/96011492917.pdfIn PDF document text
    • http://xelidamos.epizy.com/47437277385.pdfIn PDF document text
    • http://dereduvate.epizy.com/427403161.pdfIn PDF document text
    • http://wafitiw.epizy.com/79814180028.pdfIn PDF document text
    • http://wewonak.rf.gd/brachial_plexus_block_ultrasound_guided.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4BC 3884 bytes
SHA-256: 6c25aa8c169e40297781185245c7ba645920355d18128f4aeb05febfe7571558
font_01_sfnt_off0001b273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B273 5108 bytes
SHA-256: ff3dae234562b52acdc9421d0b4ffa60192ad9e8c153cdc3589ef71c683da318
font_02_sfnt_off0001c3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3DF 15732 bytes
SHA-256: 69a95baea46f75c2575d081d4794129f323a8fb81c2e71bcb5fe5076af715cb9

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