Malicious PDF — malware analysis report

Static analysis result for SHA-256 d278bc7e69f1f5c9…

MALICIOUS

PDF

130.9 KB Created: 2021-02-21 14:50:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1e879ae80ae141e9a751cc7996ccb3b1 SHA-1: 21d9de5c1d1cca3ea9f3358c032dc02a16795812 SHA-256: d278bc7e69f1f5c95a65df36623ff3beb1ec8c25e774d4ff7ea9e1605600f6ca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1105 Ingress Tool Transfer

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'bologen.ru', suggesting it's part of a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is used to host many links on disposable domains. While no scripts were explicitly extracted, the presence of PDF URIs and the overall structure suggest it's designed to lead users to external, potentially malicious, resources.

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://bologen.ru/wix?keyword=jame%2527s+horde+leveling+guide+1+70 PDF link annotation
    • https://cdn.sqhk.co/lupobikud/qjegf4s/adventure_escape_asylum_chapter_4_cheats.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376099/normal_5fe89df9215fe.pdfIn PDF document text
    • https://zogininofifus.weebly.com/uploads/1/3/2/6/132695288/bogilurojus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426424/normal_5fe518922921a.pdfIn PDF document text
    • http://changepass.online/mejakotelivabajigobowpqf5.pdfIn PDF document text
    • https://cdn.sqhk.co/vowobupubuze/Fgc9Ghf/small_lobby_design_ideas.pdfIn PDF document text
    • https://tijovozup.weebly.com/uploads/1/3/0/7/130775490/roxubonoweziri-dubakunisop-wofeviguwasom.pdfIn PDF document text
    • http://com-signto2.xyz/english_grammar_exercises_with_answers_form_2lxjga.pdfIn PDF document text
    • https://xunamokisanuf.weebly.com/uploads/1/3/5/2/135296359/xekomakuwetepi-mitesutoti-tifum-lejifovilapire.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406812/normal_5fef02be6cbb5.pdfIn PDF document text
    • https://cdn.sqhk.co/xivorotil/96gjjc6/kajekozibutitunuwunutak.pdfIn PDF document text
    • http://freshmind.net/52467205654hdl7x.pdfIn PDF document text
    • http://winsbig.space/54954063888pjiqy.pdfIn PDF document text
    • https://cdn.sqhk.co/wuluzajiroz/gjLfxib/kedokerulapabidibos.pdfIn PDF document text
    • https://bapamebitisetup.weebly.com/uploads/1/3/4/3/134325238/0ad334c0479.pdfIn PDF document text
    • https://mirulunus.weebly.com/uploads/1/3/1/1/131164386/tapanuwatuduw_jigom.pdfIn PDF document text
    • https://fuzewejobedogu.weebly.com/uploads/1/3/1/4/131482867/nepepijuzipan-gatob-sopiviwexivup-pomuwoxipepabaf.pdfIn PDF document text
    • https://cdn.sqhk.co/joxopejufito/eeijKix/80763569201.pdfIn PDF document text
    • http://sayfelengs.space/19888374930sgvcw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447630/normal_602b4d2ce8346.pdfIn PDF document text
    • https://zameleto.weebly.com/uploads/1/3/4/0/134042643/6360d5aa9b202.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/zedilegol/significant_figures_worksheet_unit_1.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/aspirin_structure.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/siduzujifikazo.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_off0001c59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C59E 5596 bytes
SHA-256: 743a97b4244700c50cea31a016a8da1bb4f29c68a18087007481a2043b393fb8
font_01_sfnt_off0001d895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D895 10860 bytes
SHA-256: 339ea426293ad3bf029b20f65138b104e3024476af84d375e7cf820b78c46c75