Malicious PDF — malware analysis report

Static analysis result for SHA-256 315644ec6cefc816…

MALICIOUS

PDF

86.2 KB Created: 2021-05-05 17:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 488f454728937e0e874609692645b09c SHA-1: 150270a52fe20cab09034b64c79f2a2342f2198c SHA-256: 315644ec6cefc816143ecc11f26a6360a4ea032bdebe20c1b014a71603fa6d34
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/strik?utm_term=download+game+maker+studio+1+full+crack PDF link annotation
    • http://sallehub.xyz/jizidezjr2oa.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/6774583358069ri7.pdfIn PDF document text
    • http://prechambre.xyz/sas_proc_report_examples_ods1bcjo.pdfIn PDF document text
    • http://mihetos.xyz/romexumejivxyzku.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosira/rqDhggc/cross_stitch_letter_pattern_cursive.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://dragonflysagewellness.com/55466386862hcs4l.pdfIn PDF document text
    • http://posurazatux.mypressonline.com/15659358670.pdfIn PDF document text
    • http://nuxelafim.iblogger.org/free_printable_coupon_template.pdfIn PDF document text
    • http://frankiearvelo.com/comprehension_worksheets_for_grade_6_englishdk43c.pdfIn PDF document text
    • https://cdn.sqhk.co/bifoligi/fhcA4id/chocolate_chip_raspberry_jam_cookies.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/azZhhhj/98534775115.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/slavery_timeline.pdfIn PDF document text
    • http://strgb2.ru/the_magicians_wiki_season_5v50jk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gevejonitu.onlinewebshop.net/vizio_d650i-b2_how_to_update_firmware.pdfIn PDF document text
    • http://vemefosa.epizy.com/transcription_and_translation_process.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc9ad308-e2c0-46a0-bd31-cb3e2b1a4f82/precalculus_textbook_solutions_chapter_9.pdfIn PDF document text
    • http://jeborawaleko.atwebpages.com/how_to_find_a_percentile_rank_from_a_z_score.pdfIn PDF document text
    • http://dirazonun.myartsonline.com/nadasowon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c92207e-58c9-4f61-a825-0bf9e5b78eae/rinnai_gas_heater_price_adelaide.pdfIn PDF document text
    • http://jivemewogipalen.rf.gd/97539847825.pdfIn PDF document text
    • http://wowadepadon.rf.gd/frozen_2_2019_full_movie_free.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_off00011204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11204 5548 bytes
SHA-256: 044f6c13e6c23efeb7b4e1256c70976b081184b1680484a1c8d18a64967beffb
font_01_sfnt_off000124f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F6 11132 bytes
SHA-256: 90bec04e41203a81804115c9b716fc3d3e7a74272be8e71e390f03f62f9f0711

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