Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c78daad851dca09…

MALICIOUS

PDF

77.6 KB Created: 2021-04-13 19:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 822b1f114c80ded5c543492ecb815773 SHA-1: ca195110d4a65c9c40a94716f9a45ebb8a3ae7bb SHA-256: 9c78daad851dca09d0601c5e3c58a79f273f9fbe7b97bbc90db7acc365c74137
126 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document body, though truncated, suggests a lure related to origami flowers, while embedded heuristics reveal a link farm structure pointing to numerous external URLs, including a suspicious one on 'druttle.ru'. The presence of external URIs and the link farm heuristic strongly suggest the document's primary purpose is to redirect users to potentially malicious websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/strik?utm_term=how+to+make+simple+origami+paper+flowers PDF link annotation
    • https://cdn.sqhk.co/jupozaregu/ij0icie/71222883451.pdfIn PDF document text
    • http://mofirixubutibi.getenjoyment.net/funciones_del_nervio_vago.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/59627458516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_60155b46e62d1.pdfIn PDF document text
    • https://vawemuziz.weebly.com/uploads/1/3/5/3/135351027/vusatobelonu_bureripawajijol_soposike_nepuwamebidaso.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/dryjeig/2176140784.pdfIn PDF document text
    • https://fotelixufigowex.weebly.com/uploads/1/3/1/0/131071188/wututudiw_xadewubinojep.pdfIn PDF document text
    • http://zomixuxoluzijum.mywebcommunity.org/dari_ke_word_candy.pdfIn PDF document text
    • http://pufivuziviv.mypressonline.com/31612014064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382960/normal_6052dfd2c3b30.pdfIn PDF document text
    • https://bafokaxaxex.weebly.com/uploads/1/3/4/8/134881351/23b888a1.pdfIn PDF document text
    • http://vepenuvix.mygamesonline.org/xaxigo.pdfIn PDF document text
    • https://cdn.sqhk.co/budatumibowu/thaLiez/piano_appraisal_nyc.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/hahbFhe/magagut.pdfIn PDF document text
    • https://bizepusenovub.weebly.com/uploads/1/3/4/5/134509919/a5787.pdfIn PDF document text
    • https://bezesigut.weebly.com/uploads/1/3/2/6/132681157/zunabigukaborime.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eae771bb-0f1e-4a13-b366-a6f11b0d6a3c/sloan_flushmate_503_tank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/044ebf35-2aea-4661-9e40-301411e01bf7/mechanics_of_materials_solution_manual_beer_6th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4abcf7-5748-4013-b565-5c861dbe4e36/honda_fg110_transmission_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f1f46a0-05c4-4658-9d22-15cc5cb578eb/tabla_periodica_de_los_elementos_para_imprimir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5697c5e6-f568-446e-9a34-208fe29ba7b9/logitech_k400_plus_wireless_keyboard_price_in_india.pdfIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_b3dfeea780f04cbfb487e18d6499b590.pdf?index=trueIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_c71a7ceb5b1b466ca906b212d9070fe9.pdf?index=trueIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_533bb62f2f264978b0d32056d4078ffc.pdf?index=trueIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_7d6bf4ca6df4482a9707258675a2a027.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 5340 bytes
SHA-256: fdfd703ee62bcc4238baf2e96947829efc51a8c2cfb4a655f9cef23ec381d6b2
font_01_sfnt_off00010398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10398 10848 bytes
SHA-256: b12347d60068503f2db4fdd9fb102007435cd0c0052245c2e056bd8a240b204d