Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b61335c75c0cc56…

MALICIOUS

PDF

81.8 KB Created: 2021-04-04 19:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6bd598d1e8c7b4334f7bdcbac3cad3b3 SHA-1: 1312f8c528377ebed7b6b59577b606cb6ccb36c8 SHA-256: 4b61335c75c0cc56a00f46e5016d1762b83c5a72f6fae28caa4b6b198851cd63
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. 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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/wix?keyword=operant+conditioning+practice+worksheet PDF link annotation
    • http://vinnipoh.fun/are_army_rangers_better_than_navy_sealsz7fg0.pdfIn PDF document text
    • http://smartradiobf.ru/aerodynamics_for_engineering_students_7th_editionqokce.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://creditscoretracking.info/wirujurogutalukukefavale8n952.pdfIn PDF document text
    • http://lovemecompletely.com/office_365_proplus_activation_report_powershellt02gw.pdfIn PDF document text
    • http://moviesaddaa.online/sejofapadow36iga.pdfIn macro / runtime command snippet
    • http://natural-shop.info/vipuwaziputeq8a04.pdfIn PDF document text
    • http://my-favshopg.online/76290182570gsmdy.pdfIn PDF document text
    • http://sarhello.online/sefozirudizujipulegejuwo7nqb1.pdfIn PDF document text
    • http://vbruti.site/46786820991vaax2.pdfIn PDF document text
    • http://front-glass.space/49138977727zpyrd.pdfIn PDF document text
    • http://itslm.fun/22658491727vxsk1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://1b3e2d6a-0348-4772-9bb2-16e56a761455.filesusr.com/ugd/7bcf02_29208b6611d349e7b2a82822afc7994a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c57b411-553d-44ec-82c1-dc72f77908ac/how_long_to_cook_turkey_chili_in_crockpot_on_low.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/tvc_storyboard_template.pdfIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_110e87f33e7942dabb20d950ccd1e8d9.pdf?index=trueIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_bcd2db3bbf834148844cc58cc67b7e7f.pdf?index=trueIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_2de8a64cb49f420fadd2f6b1f99a9897.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0cd6070-80a4-4137-98f9-de6216cb2537/golds_gym_xr45_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/mosunite.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/wozej.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
    • https://uploads.strikinglycdn.com/files/In macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD4 5276 bytes
SHA-256: 4ed33fdb4e854e0a29c64d58a766269da2ef7237819571b2c3aef34d897a739b
font_01_sfnt_off0000f1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 10576 bytes
SHA-256: f457bbd3ff615d896bebc2a219fe6e93cd05fa021c793745b3c4baff752cb051
font_02_sfnt_off0001160f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160F 16092 bytes
SHA-256: c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e
font_03_sfnt_off00012ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD7 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

Open this report in the interactive analyzer, or submit your own file for analysis.