Malicious PDF — malware analysis report

Static analysis result for SHA-256 24894d51b1af40b1…

MALICIOUS

PDF

117.9 KB Created: 2021-04-03 18:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: feb321b471302bbbbaa7a3c5db658450 SHA-1: 5ab97436824778671771fb363f2ec0fecbd7eaf3 SHA-256: 24894d51b1af40b1fafafc14836e09065caf388d3adc305cc928cffa37a6683d
126 Risk Score

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 0.9959

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://dafemum.ru/123?utm_term=idsa+guidelines+esbl+uti PDF link annotation
    • https://cdn.sqhk.co/wavudasawete/i4jcXib/zaxaj.pdfIn PDF document text
    • http://vawagizipul.iblogger.org/how_long_does_wilderness_first_aid_certification_last.pdfIn PDF document text
    • http://private-channel.site/319681896865mm42.pdfIn PDF document text
    • https://cdn.sqhk.co/pobopuwubox/hehdihT/rexall_flyer_london_ontario.pdfIn PDF document text
    • http://lovemecompletely.com/i_am_a_child_of_god_song_youtube5ygsq.pdfIn PDF document text
    • http://wazasipu.iblogger.org/91914467701.pdfIn PDF document text
    • http://gufutaca6.xyz/did_mark_watney_die_in_the_martianwnnxd.pdfIn PDF document text
    • http://about-igsupport.com/jujuxanujotatofanu9t4v7.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/hijinhh/live_five_news_app.pdfIn PDF document text
    • http://sunipemumax.66ghz.com/austro-_hungarian_army_uniforms_ww1.pdfIn PDF document text
    • http://noverst.xyz/31720226984nj7n9.pdfIn PDF document text
    • http://doctora.club/85214205999wlgxk.pdfIn PDF document text
    • http://sijowusim.22web.org/chronicles_of_narnia_1_free.pdfIn PDF document text
    • http://vvinorama.fun/yeah_baby_whatsapp_videobu06x.pdfIn PDF document text
    • http://perevozka.ru/dimonunafolotape36w0k.pdfIn PDF document text
    • http://clubstore.info/74239957954ghejm.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/gxgigdj/govuvukusekubejowixaxulo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/50637989525.pdfIn PDF document text
    • http://gowamatul.epizy.com/23892009049.pdfIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_3972e99fcbf94859974cb7132caef003.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/sumofejadasuwek.pdfIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_d0a458d5eb444180b054ce561b3a9487.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/litunux/el_principio_del_placer_resumen_por_capitulos.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/pubg_mobile_esp_aimbot_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/how_to_play_baldurs_gate_2_multiplayer.pdfIn PDF document text
    • https://c4fca8c4-0f54-45c3-ae88-320069d86c16.filesusr.com/ugd/ac0d21_a0733bc09a1c47ecaf42c9627a2dafa4.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BEB 4976 bytes
SHA-256: 96fa5303dbedf3d88d776271ae1665bbb000210858edef479cca334b23808623
font_01_sfnt_off00018ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CE5 11408 bytes
SHA-256: 666d8bfe0fdca8ba2e008ed86b5f67a675f6e920af1e6f8c13e5042dccd0b1f7
font_02_sfnt_off0001b438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B438 16148 bytes
SHA-256: 49436f94d5abf10ca6af8af9848174aab82dfe7bc58a5146411d238fd5c76648