Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a7b1d9135d1633…

MALICIOUS

PDF

181.3 KB Created: 2021-03-18 05:51:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f161229730c1154dac1a5556717c325e SHA-1: 2a137c52abd8697303e3e3183b4ce032f6613dfa SHA-256: 34a7b1d9135d163381fea6e05fad931c0e72af533e0bde2148abc503b2188092
126 Risk Score

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 0.9903

Heuristics 5

  • 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 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=fallout+new+vegas+how+to+install+mods PDF link annotation
    • https://cdn.sqhk.co/xivomojuf/Iznidhe/no_notification_sound_iphone_xs.pdfIn PDF document text
    • https://cdn.sqhk.co/tavedikovo/PDhgegi/gowigeja.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/jhfQGhh/spectroid_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/kavuweduti/i46djc6/honda_civic_type_r_fn2_performance_parts.pdfIn PDF document text
    • http://fowuwoxex.iblogger.org/porter_cable_router_1001_edge_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/ahgggIJ/carpet_cleaner_machine_rental_safeway.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_8eacfb2264a64ab5b0c1dafcb0f362d7.pdf?index=trueIn PDF document text
    • https://8b7199fc-a029-4910-8138-caee300d1cbd.filesusr.com/ugd/da8f68_c929e23c26c44c939d003d1ba438bcc4.pdf?index=trueIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_30cfd0e1ce114b3989eda7ee44b68bc5.pdf?index=trueIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_8abb656b6d1745d68a647dafaa56bdd8.pdf?index=trueIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_2555cf24c48544848fada88a69342d54.pdf?index=trueIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_5c03401935154f19a50bd1e10224a171.pdf?index=trueIn PDF document text
    • https://3c1ad7ec-bfc7-452d-a92a-0d22078d3251.filesusr.com/ugd/c6e823_56e8ab4fdbd045c79392016efb234f73.pdf?index=trueIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_8a5e46d59d1d48a5993b9f35ea2589c4.pdf?index=trueIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_7e3378db49a0481ab573d328c0b4539d.pdf?index=trueIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_a1c571c1fbd04c3690ee6351e17c3501.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/348121ad-aa84-4dc2-8fd3-173a13f17f47/dell_vostro_1500_laptop_drivers_windows_7.pdfIn PDF document text
    • http://nuduvemomuto.epizy.com/figalezajigurez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac146dd4-823c-428b-8978-8a536b157136/56714023351.pdfIn PDF document text
    • http://firiveperoju.epizy.com/79434199289.pdfIn PDF document text
    • http://wekameti.rf.gd/61583473018.pdfIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_4752b7a98a904ebc8ddcd1224e033e83.pdf?index=trueIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_20c03453dbb84de79a013e78a1510122.pdf?index=trueIn PDF document text
    • https://c3bb11cb-ba02-405d-8462-2b4421b436e1.filesusr.com/ugd/4c7814_dfb4eec90c8347e2a45e43de4a1f97ba.pdf?index=trueIn PDF document text
    • https://320f262d-053d-461a-9009-498fa3b044f5.filesusr.com/ugd/8e680a_77a4fec31b244152a52ca18d2bf2d549.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dc26aec-a849-4215-8781-08c3675f7994/how_to_clean_head_on_canon_printer.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_off00028cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28CC8 5248 bytes
SHA-256: 9c1524090a6843730673db3342826b563b460c4d159225977ce2f75bbee192fc
font_01_sfnt_off00029e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29E9D 11824 bytes
SHA-256: 2a9a727f3c2447a83064a8775b00867cc74b8e9e40035e92e3df8b411dac7797