Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1bc8d1542583ee…

MALICIOUS

PDF

78.4 KB Created: 2021-03-13 20:40:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 506d86bd3ef3af22d3f16e898b85f4d1 SHA-1: 6a50bb6ad416935aa7486d2aa59465d96247da29 SHA-256: 8e1bc8d1542583eee357c32c7c67e8217e2ea6ffae7ae3f61d33e85a413bc38d
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 0.9996

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://nipisod.ru/strik?utm_term=interior+design+program+for+mac+free PDF link annotation
    • http://remastacer.com/geometry_6.7_dilations_worksheet_answer_keyje856.pdfIn PDF document text
    • http://axacheat4.xyz/team_associated_b5m_transmission1oysv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_5fe6b4c3df302.pdfIn PDF document text
    • https://pimakesoxokozo.weebly.com/uploads/1/3/4/0/134041299/bewinenaw_gifigazagili_ravekotu_rexigopinujoket.pdfIn PDF document text
    • http://bonboxstudio.com/top_parkour_games_pcgpcfx.pdfIn PDF document text
    • https://wegizitog.weebly.com/uploads/1/3/4/6/134685086/wanatexi.pdfIn PDF document text
    • http://zuxemesemubozo.mywebcommunity.org/neoliberal_capitalism.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462037/normal_6019c7ad6884b.pdfIn PDF document text
    • http://tumbochka.space/analogies_worksheet_grade_4k10ch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409609/normal_603bc2f98055b.pdfIn PDF document text
    • https://demuvejujewik.weebly.com/uploads/1/3/4/0/134042515/35060b2bdfdc14f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465007/normal_604026ecc4560.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405922/normal_5fca12b36dbbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465389/normal_5fc570ed75fd8.pdfIn PDF document text
    • http://leyloften.online/pogixalulufhxo9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489054/normal_5fcd6c547b4da.pdfIn PDF document text
    • http://fosavaxenu.mypressonline.com/59287893035.pdfIn PDF document text
    • http://copyrightshelpcenter.com/radunlvhs3.pdfIn PDF document text
    • https://zajinepimasi.weebly.com/uploads/1/3/2/8/132815118/runerebujitafizusipe.pdfIn PDF document text
    • http://modernstyle.pro/hamilton_beach_flexbrew_49974_manualg2gl8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459320/normal_5fdd8edacfd39.pdfIn PDF document text
    • http://buytoday.cc/battlefield_2142_fullt2sy4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 5380 bytes
SHA-256: 7ecc6c934d982837341bc615c5db487ad3952cc70572ffb65c862702462cd21b
font_01_sfnt_off00010714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 10864 bytes
SHA-256: ac2774a146cc97bdac9ce7dbfdf6ec2496a7948e3e9295dcad2bb20bb43511e6

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