Malicious PDF — malware analysis report

Static analysis result for SHA-256 10cb5d1b2039a3b3…

MALICIOUS

PDF

82.4 KB Created: 2021-04-18 11:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b02d3a37d651f73c8c6c023bfba4b9ff SHA-1: 75e1c5d4629784bb4124313c4a459654122ff8d7 SHA-256: 10cb5d1b2039a3b3a34f1b159651c1a7aa88494c4455e463b47012c8b74cbcd2
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 0.9961

Heuristics 5

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=what+do+i+need+to+get+my+cdl+learner%2527s+permit PDF link annotation
    • http://kunutudusoxa.mywebcommunity.org/happy_birthday_easy_piano_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/fgjihij/kufarawewirotutafuxe.pdfIn PDF document text
    • http://bajifepeselok.sportsontheweb.net/48075566223.pdfIn PDF document text
    • http://bewizasosu.sportsontheweb.net/filuxowetuze.pdfIn PDF document text
    • http://lesantyqas.online/rujurikeketezuroaqdhn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495393/normal_605d23793492c.pdfIn PDF document text
    • http://xabidewukolesas.66ghz.com/bloodstained_ritual_of_the_night_trophy_guide.pdfIn PDF document text
    • http://zakomuxoza.getenjoyment.net/92265593356.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365620/normal_5ff0a1167aed5.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/igEKLii/39769537975.pdfIn PDF document text
    • http://robefixelajimod.22web.org/how_to_say_yah_in_hebrew_god_bless_you.pdfIn PDF document text
    • http://letnesil.xyz/fuberubh58l0.pdfIn PDF document text
    • http://bagagapesum.22web.org/android_emulator_for_low_graphics_card_pc.pdfIn PDF document text
    • http://cmb-eco.com/woodworking_bench_top_material4tgrb.pdfIn PDF document text
    • http://fonivoguko.medianewsonline.com/vafuxukurunaxezifozusewe.pdfIn PDF document text
    • https://cdn.sqhk.co/roxigeve/Nijd48R/wojox.pdfIn PDF document text
    • http://fulokixowo.scienceontheweb.net/gesobobux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445532/normal_5fe0be0de21b2.pdfIn PDF document text
    • https://cdn.sqhk.co/sesudegaruta/heAEhgN/best_android_phones_in_nigeria_2019.pdfIn PDF document text
    • http://storeeu.info/suddenly_seventeen_eng_sub39kq9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483331/normal_6065965f5899e.pdfIn PDF document text
    • https://cdn.sqhk.co/nowagenika/higedge/vileguzelusulutopebev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabodegodonirad.atwebpages.com/62104790339.pdfIn PDF document text
    • http://sugexure.rf.gd/90318874540.pdfIn PDF document text
    • http://todiwefexoneb.atwebpages.com/cfa_level_1_book_4_free_download.pdfIn PDF document text
    • http://mujujum.epizy.com/vofalokomaxulef.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_off000100b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B8 5636 bytes
SHA-256: 6ffee80883b9ec9bf755f68c0dd07c45d82cd39ac06ce95d392f86fd6dc6f414
font_01_sfnt_off000113d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D9 10944 bytes
SHA-256: c0372b5bbc429bf4bc0c723f413860315ba71806f9425fea18d385dbb2b20777

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