Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08d5a18016a9a7d…

MALICIOUS

PDF

93.4 KB Created: 2021-03-26 10:02:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9d1ca4d914ef7108a8035027a29dfc72 SHA-1: 537fa68800dd387bf017ee646e820646bc6103cd SHA-256: f08d5a18016a9a7d838fc5333d0d14d85c01db435c5b71e0ea0f0508ea92639b
186 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. 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 0.9993

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 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.
  • 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://golowaki.ru/strik?utm_term=aprendizaje+basado+en+proyectos+ejemplos+secundaria+ingl%25C3%25A9s PDF link annotation
    • https://vejelajaluseno.weebly.com/uploads/1/3/5/3/135392022/fevowenotu.pdfIn PDF document text
    • http://fozivot.mypressonline.com/biology_class_12_ncert.pdfIn PDF document text
    • https://datedevob.weebly.com/uploads/1/3/1/3/131381982/tolaxuzefizixo.pdfIn PDF document text
    • https://dazuvekojuj.weebly.com/uploads/1/3/4/8/134863877/mesovafiwifokeweg.pdfIn PDF document text
    • https://vuwawirekexaz.weebly.com/uploads/1/3/0/9/130969699/ff1b5f42f2d06.pdfIn PDF document text
    • https://devegiwosoti.weebly.com/uploads/1/3/4/5/134592662/6759c03662a0f.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/146ecbb3-ca29-4f62-a539-e13a33924c2c/husqvarna_chainsaw_model_240_chain_size.pdfIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_e4eb8001d6e347dd8432a662130fd888.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/45721195254.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/arch_linux_desktop_iso.pdfIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_3c2418e0941c417280e082899c1d545f.pdf?index=trueIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_b5879fe955ef48db90ba71355e671d14.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_0907fcac6673438cbdb5acf68c96d515.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f4d0c00-ecd9-4c3f-a61f-f01161041647/24183947179.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_61bfcf5be22a40fbb679804193eb6374.pdf?index=trueIn PDF document text
    • http://sipanokule.onlinewebshop.net/18013824446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/532c8c5f-e345-4ac4-8217-357a37571016/38970832393.pdfIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_8d4d9159917446b2a98d0c7e0a6642a6.pdf?index=trueIn PDF document text
    • http://naxepedawizozet.onlinewebshop.net/farsi_alphabet_chart.pdfIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_7c2989653cd040af955793ffa2157a82.pdf?index=trueIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_4e628a74898b435c9b7590d2926ee213.pdf?index=trueIn PDF document text
    • http://naxesabefadufu.atwebpages.com/optiplex_gx620_processor_support.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/midland_gxt1000_manual.pdfIn PDF document text
    • http://kuxemozoxabonag.onlinewebshop.net/secrets_to_spiritual_power_watchman_nee_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/87538870366.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_off00012b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3A 5892 bytes
SHA-256: e33dc2a80345aa7844b2bf44fae00736231f0b9d07d33d147175dda2808ef3b6
font_01_sfnt_off00013eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EFF 11636 bytes
SHA-256: 9cf71b6e9eb8b56c9fd64fde486fe26bc3d74989bf7758a885103d5053af8ca2