Malicious PDF — malware analysis report

Static analysis result for SHA-256 d951d3f49d1621c5…

MALICIOUS

PDF

92.2 KB Created: 2021-03-23 10:01:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 48aa3809f336e3fd7d71c8d89e35bb7d SHA-1: b6e45586edd59364b45c33c8c89974ae48906cce SHA-256: d951d3f49d1621c5f4c26c94e6e3406105fc4d44bb6e21094956eb1f1b9bb841
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dugedepap.ru/award?keyword=arihant+mathematics+book+pdf+download PDF link annotation
    • https://cdn.sqhk.co/fixijolexap/icgj7Ir/national_boss_day_the_office.pdfIn PDF document text
    • https://taxajefikudo.weebly.com/uploads/1/3/4/7/134765143/7696100.pdfIn PDF document text
    • https://cdn.sqhk.co/nokowifupe/Kar1hg6/kopegavul.pdfIn PDF document text
    • https://fexiragija.weebly.com/uploads/1/3/1/4/131409693/9440606.pdfIn PDF document text
    • https://namosupegu.weebly.com/uploads/1/3/4/3/134313644/moxenatub-jijebigigimejir.pdfIn PDF document text
    • https://fafetomipisiso.weebly.com/uploads/1/3/4/6/134603542/6954025.pdfIn PDF document text
    • https://fiwugoxatalaj.weebly.com/uploads/1/3/4/4/134498599/9168625.pdfIn PDF document text
    • https://cdn.sqhk.co/tivanosox/dicgige/weekend_warriors_mma_ufc_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/jesotipo/CoifhfI/pet_pals_santa_cruz_california.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/igpsijc/87357932944.pdfIn PDF document text
    • https://wopadutizibum.weebly.com/uploads/1/3/4/3/134306931/kisexuvenif_giwabojut.pdfIn PDF document text
    • https://mokaredoraxo.weebly.com/uploads/1/3/4/0/134095924/xijur-waxovi-mebatu-ganoxugovi.pdfIn PDF document text
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/vubadutitogaze-nelafi.pdfIn PDF document text
    • https://rowiteruna.weebly.com/uploads/1/3/4/4/134470704/dipisiv-mireb-kopozatutem.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/types_of_public_relations_research.pdfIn PDF document text
    • https://kisobodowawon.weebly.com/uploads/1/3/1/3/131384145/foleta-sonolopuxofefa-devasagevamazuk-wopetoxubi.pdfIn PDF document text
    • http://goligofalu.medianewsonline.com/acetilcolina_farmacocinetica.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_d1227612dfe14cc8bb355aa8c5ce01af.pdf?index=trueIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_5672e70312a349dabe9a36d22613d653.pdf?index=trueIn PDF document text
    • https://99b08629-27b2-41dd-83a1-938dc2ca35bd.filesusr.com/ugd/067ecb_dbf53b1a0db5452fa161f31029975b07.pdf?index=trueIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_08c23fea4af44cd4b4d62c75441e521e.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 5680 bytes
SHA-256: 0c30b844d0e9e967ac44e32dd4ec873cc7a5b66df6351e46a1e403cb26cac8e1
font_01_sfnt_off00010bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off00011713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11713 10692 bytes
SHA-256: 61eb553f1110dde45273625685ac991ce195421dbed11a4a546ed50d7707b194
font_03_sfnt_off00013bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDB 12256 bytes
SHA-256: 2bb418275a12b5ce97164ca3c6b006b228078c85d7e42ea61bb01bbdd0fed1f8

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