Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b70610869a67e0…

MALICIOUS

PDF

85.0 KB Created: 2021-04-07 20:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e28bff69991821f173a880496e89055d SHA-1: 72a89e0f46ee50db5dbc58721e0584e2da79ba9b SHA-256: d6b70610869a67e09d59ff5dd9bff4637bc6c0a7b4dceacc65f1412b7b35bf73
186 Risk Score

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/aws?utm_term=diablo+2+cd+keys+free PDF link annotation
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/sibupilonawe.pdfIn PDF document text
    • http://metazoaapc.fun/867383916289ist1.pdfIn PDF document text
    • https://loleritukala.weebly.com/uploads/1/3/0/9/130969936/vuxonu-fuwixaledegide.pdfIn PDF document text
    • http://istlan.fun/39768112213hel8t.pdfIn PDF document text
    • https://cdn.sqhk.co/joxutedunik/hjX7hbM/idle_defense_lf_freeze.pdfIn PDF document text
    • http://ru-1.casa/lerefevanevufibobemilim46zyd.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/hamVgjZ/vigutofurebimobokik.pdfIn PDF document text
    • https://moxamegok.weebly.com/uploads/1/3/3/9/133999551/lixezoforunanuxet.pdfIn PDF document text
    • https://cdn.sqhk.co/votawusebak/bPaJEIM/ant_farm_theme_song_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/remokuvupen/2geigjb/the_four_seasons_vivaldi_sheet_music.pdfIn PDF document text
    • https://roxewakedenal.weebly.com/uploads/1/3/1/4/131483042/5573783.pdfIn PDF document text
    • https://cdn.sqhk.co/mebereserab/jjhRZWB/descent_2_road_to_legend_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/zovuteziranopilonaju.pdfIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_a699828af387437d858ef2b015dab959.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nijudow/lonely_planet_guide_berlin.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/adding_and_subtracting_integers_worksheets_math_drills.pdfIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_fbe5f1a6880841fe8d70bb6d248f6b01.pdf?index=trueIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_3b6f8357b29e4ab1b6079a07fe43f8b8.pdf?index=trueIn PDF document text
    • https://dce579ed-4708-43c3-aaeb-2c76a6268d78.filesusr.com/ugd/944939_2248ae8ade404c9a928f52844e1a2b00.pdf?index=trueIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_6a45236adb9b4bb0a00909f48b10e44c.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BA 5052 bytes
SHA-256: 4ee05478ad9ef1d2034fa6337ec0dc0378b2bb180563181c745804fc39a7c42e
font_01_sfnt_off000112f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F6 11016 bytes
SHA-256: df43739586c4cb3fb0e632ad26831428b2d2c11b2ac421ebc3aa9b738942c0e1
font_02_sfnt_off000138c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C4 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71