Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ec1b5628b0ba24…

MALICIOUS

PDF

72.0 KB Created: 2021-03-31 11:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 496c30415cf3a9acbd1a8417aa92bfd4 SHA-1: b81f6c66239480b06e593f0df988a1d33dc3750e SHA-256: 21ec1b5628b0ba241849d744bd2356a20d014cd5044f699c7596e993d157ebe8
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/wix?keyword=ascp+boc+study+guide+pdf PDF link annotation
    • http://soldonlittleton.com/makufalemuvia75v0.pdfIn PDF document text
    • https://cdn.sqhk.co/dodalowogiv/iighCE2/dexadaranetitovamazufowov.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/agcgdbb/56967141364.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/tUgZThc/luna_s_fate_mod_apk_1._8.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/jbChfpz/word_talent_word_connect_word_puzzle_games.pdfIn PDF document text
    • https://cdn.sqhk.co/gidetixi/jfeohiP/octopus_watch_v2_screen_protector.pdfIn PDF document text
    • http://lenusabipowezo.getenjoyment.net/warhammer_40k_ninth_edition_release_date.pdfIn PDF document text
    • http://my-favshop.online/download_minecraft_pixelmon_mod_for_androidh87qv.pdfIn PDF document text
    • http://bodipok.getenjoyment.net/muxuluxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://divojeniro.epizy.com/crm_dynamic_worksheet.pdfIn PDF document text
    • http://lofomaseforuz.rf.gd/45009984413.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/hey_jude_sheet_music_violin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f938bf-a39a-4a2c-a0f5-f8efb76bf13d/92347523538.pdfIn PDF document text
    • http://xonekalanalu.epizy.com/ffxii_bazaar_guide_zodiac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e24f9351-d4ac-453a-88ca-ea824c71fd0c/how_to_pair_microsoft_bluetooth_mouse_and_keyboard.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/android_os_battery_drain_keep_awake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92e0b14a-93d2-4860-9faa-b5df336402d8/celtx_to_online.pdfIn PDF document text
    • http://kokofotalixik.epizy.com/danubefamalibupitivuzaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/affiliate_marketing_beginners_guide.pdfIn PDF document text
    • http://divupovive.epizy.com/debabotowesiriduvafoxis.pdfIn PDF document text
    • http://mojigoka.atwebpages.com/cambridge_primary_english_activity_book_stage_2.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

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_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 5216 bytes
SHA-256: 414e3280c502b8fe50b67163e9b4062f758c6fbc94b5663d628e96ba842d2b2f
font_01_sfnt_off0000ed9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 11844 bytes
SHA-256: f9fbfb4e95c9226b15dc670890878ea448fe6cc039f5d1c82d914fa84d58076d

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