Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9337a726c5a0c1…

MALICIOUS

PDF

158.6 KB Created: 2021-03-14 10:12:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 77f42c56cf5a4ddefb0e9f1958e2dff6 SHA-1: 23f525504025a43dff234c06aebddec1f6a1672a SHA-256: dd9337a726c5a0c1e8e7661c210d01d4e24c5bb929255b3774ca978281da33c9
134 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. It uses an urgency-based lure. 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 0.9994

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://midufefew.ru/award?keyword=dc+metro+map+pdf+2020 PDF link annotation
    • http://driveformclanemilwaukee.com/guidelines_for_pap_smear_results0db08.pdfIn PDF document text
    • https://cdn.sqhk.co/bedazume/jhif1hg/among_us_mod_and_map_for_minecraft_pe.pdfIn PDF document text
    • https://cdn.sqhk.co/piwuzuberaze/gfd4jjG/11049314304.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392237/normal_5fce918c101cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458839/normal_600dfe3e44966.pdfIn PDF document text
    • http://criticcxck.space/present_simple_exercises_for_beginnerse6iww.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487927/normal_5fd3183e87a00.pdfIn PDF document text
    • http://kyrgyztours.com/english_vocabulary_words_with_tamil_meaning_free_downloadcbyfl.pdfIn PDF document text
    • http://agreevudb.rest/minna_no_nihongo_lesson_1_to_25_audio_download4504k.pdfIn PDF document text
    • https://cdn.sqhk.co/panosiritu/h3aqfgj/35395114629.pdfIn PDF document text
    • http://baltika-trans.com/91136140960a3vcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465142/normal_601c020f64ea3.pdfIn PDF document text
    • http://adanakebap.org/solitaire_freecell_for_pcza3tn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tejufujoketaw.epizy.com/margaritaville_concoction_maker_recipe_book.pdfIn PDF document text
    • http://satikemapobivix.epizy.com/bloom_s_digital_taxonomy_verbs.pdfIn PDF document text
    • http://dezenaxo.rf.gd/32304334726.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_off00022fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22FD7 5364 bytes
SHA-256: 55119ba47fffd7da08941ff53e1627638f9344d8ecf37c80f0d4a13ec34cb109
font_01_sfnt_off00024207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24207 12456 bytes
SHA-256: 585c3827765578496b9e86785041b97ee386c4f73b70d7cdea7ba5d885bfed57