Malicious PDF — malware analysis report

Static analysis result for SHA-256 02ab3c4119558b5e…

MALICIOUS

PDF

81.4 KB Created: 2021-03-04 14:18:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4d3f540de721e3039111cc690ea99b43 SHA-1: 78523af2bcc0f49d9b8fb4b7c7a2acf34ef25c80 SHA-256: 02ab3c4119558b5e24e8f3a8e8b5f477f7255ae99a77932ba712ac498b634e8d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL, 'https://baarspo.ru/strik?utm_term=linux+kernel+programming+projects', is likely used to distribute further malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://baarspo.ru/strik?utm_term=linux+kernel+programming+projects PDF link annotation
    • http://tujasumetozuku.22web.org/pesologesasoso.pdfIn PDF document text
    • https://cdn.sqhk.co/netimupoxojo/hkheegC/10128794290.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/jejjMIW/crowder_songs_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467561/normal_6014d25c5a54c.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/Mghvbhd/mortal_kombat_9_mileena_costume_3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370267/normal_5fe2850bb8a5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/takateg/auto_record_calls_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acb96f45-f595-4d91-ae99-dd91db893cc0/ge_pension_buyout_phone_number.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/ias_topper_2019_answer_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/what_does_neo-gothic.pdfIn PDF document text
    • http://bozonesowozo.epizy.com/kunanodokinekikiloz.pdfIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_88b6992307d74ea6bab6b6be6459839e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/sejekedodufu.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/vuxirizunokewuwefagise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6984f42-aa0f-428a-8291-d0208d541ed6/que_es_una_sentencia_interlocutoria_en_materia_civil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b3ecca5-9021-4628-8118-efc145ebb953/cub_cadet_ltx_1050_drive_belt_routing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a68de1b-bf48-4d6b-9063-4a3700d8e501/lowrance_elite_4_chirp_installation_manual.pdfIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_b3c1d2c516e04d5faca1f052d19f7d85.pdf?index=trueIn PDF document text
    • http://notewajojop.rf.gd/27751982503.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61E 5400 bytes
SHA-256: 458bbef5e555f29859ec63bd2e13da358984902adec450475609aea9b4426e2c
font_01_sfnt_off00010873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 1952 bytes
SHA-256: 0cdbcdb77f697d125efbe5bb4805316d67a7ce361b0a24fbb7756eff92436db7
font_02_sfnt_off000111d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D3 11448 bytes
SHA-256: c5a1d40e7fdd34fe06f824bd1f1823c2a11f3c8f142467f5565b0d5a1bb58bf7

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