Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25d865c395e4980…

MALICIOUS

PDF

80.9 KB Created: 2021-03-25 04:54:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c8062ed4ead27da0261eca0cb4464ae5 SHA-1: 9fcf5a0fad3500523d4ee71f955d8acee7f72ec8 SHA-256: b25d865c395e4980b3cd17074ec127a4134e63babcc3d37f3b6ac9c09d78c30b
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 0.9957

Heuristics 6

  • 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.
  • 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://soxebez.ru/strik?utm_term=how+to+thicken+crockpot+chili PDF link annotation
    • http://tivaser.iblogger.org/puludokejo.pdfIn PDF document text
    • http://jizotolifuvi.iblogger.org/72066100083.pdfIn PDF document text
    • http://habercigo.com/90780055494c78bv.pdfIn PDF document text
    • http://vienvozvrat.site/primer_plato_in_english_translationtmnlj.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/how_to_paint_a_room_with_a_chair_rail.pdfIn PDF document text
    • https://salogisamokowo.weebly.com/uploads/1/3/4/6/134649366/misakumetupovara.pdfIn PDF document text
    • http://gimakelodikovij.iblogger.org/symbol_barcode_scanner_ls2208_programming_sheet.pdfIn PDF document text
    • https://jikovezogid.weebly.com/uploads/1/3/1/4/131407088/3667927.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/faktor_resiko_atonia_uteri.pdfIn PDF document text
    • http://xorelurisadadun.iblogger.org/fitness_blender_workout_plan.pdfIn PDF document text
    • http://salonvarna.com/line_of_succession_history_definition95o7h.pdfIn PDF document text
    • http://ruwulabosubev.iblogger.org/altair_inspire_tutorial.pdfIn PDF document text
    • https://dowolozudatu.weebly.com/uploads/1/3/4/0/134000293/4741269.pdfIn PDF document text
    • http://shop-you.xyz/239715977238ib58.pdfIn PDF document text
    • http://zisezamerares.mygamesonline.org/81787075890.pdfIn PDF document text
    • https://winenexosipagep.weebly.com/uploads/1/3/2/8/132814343/senawigoneb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_0e6a1e43381449a481f32345cc44c167.pdf?index=trueIn PDF document text
    • http://wokidomogu.onlinewebshop.net/adeptus_ministorum.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_97abe4ffa37b45899fdea768dcc5057a.pdf?index=trueIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_8155563d58b044bcb6076d37391f54f2.pdf?index=trueIn PDF document text
    • http://vobozezojip.onlinewebshop.net/organic_nomenclature_practice_problems_with_answers.pdfIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_4eab2cc855e248eb83e47157a34edad3.pdf?index=trueIn PDF document text
    • http://kubunixa.epizy.com/compare_and_contrast_cats_and_dogs_venn_diagram.pdfIn PDF document text
    • http://molewivuwomap.epizy.com/mathematical_physics_syllabus.pdfIn PDF document text
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_1e4515b671604307b8e5b7b5d095f9cb.pdf?index=trueIn PDF document text
    • http://lokuvutifinulef.rf.gd/disujadeparesugowawajede.pdfIn PDF document text
    • http://toxisokipefofo.epizy.com/bupon.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_off000100bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 4748 bytes
SHA-256: 64e2d037796fb87c8cffd49355c3c49925ec1c57dccea86e40046194209fccb4
font_01_sfnt_off000110f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F0 10388 bytes
SHA-256: 2dd43a3221b352c919787c5f40cd1ebe29ca5570ff99efe8d5c1233a8aaf688b