Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc89554e492f16c…

MALICIOUS

PDF

80.4 KB Created: 2021-03-14 01:40:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4e5f4d43adf9c065f66bf789fde00465 SHA-1: d10c6e0c5c698a388b0f780e8e665eebeb7d231c SHA-256: 2fc89554e492f16c6d205236938f88bf6502df7fb5b112bd25c291fd3bea7efa
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm. One of the primary URLs, 'https://maypoin.ru/strik?utm_term=how+to+rebuild+a+craftsman+pressure+washer+pump', suggests a lure related to technical information, potentially to disguise malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, pointing towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://maypoin.ru/strik?utm_term=how+to+rebuild+a+craftsman+pressure+washer+pump PDF link annotation
    • http://kkkirrreeee.space/ice_cream_maker_summer_functionbh57l.pdfIn PDF document text
    • http://natbeach.space/fl_studio_producer_edition_tutorialzt8fh.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/nonufewi_zuwovuwexos_bafovenabur.pdfIn PDF document text
    • https://jifefovemerozix.weebly.com/uploads/1/3/4/4/134444698/latuditotido-fikesom-fodegapu-nenotib.pdfIn PDF document text
    • http://mebelrostov.ru/194960230337xusr.pdfIn PDF document text
    • http://ses-paypal.com/432412606588nzjs.pdfIn PDF document text
    • https://xamukujivova.weebly.com/uploads/1/3/1/3/131384573/5209190.pdfIn PDF document text
    • https://tofavasexivefet.weebly.com/uploads/1/3/4/5/134578877/notuwexajufadixaj.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/tabobujimo/important_functions_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5989deab-5802-4c60-bb64-67df8e6b2149/32702259443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a73b6a4-bf01-43f4-9b9b-02d9e3107e0f/mean_median_mode_range_definitions_posters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64855ba0-d1ef-471c-9034-003a909c2e9f/83956803381.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/ruwoxo.pdfIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_eb0e89eb82a044fb96f0e1507dd74e06.pdf?index=trueIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_2e4d7ce3fb4348c79cbdba7823df23f4.pdf?index=trueIn PDF document text
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_c3a6ede381684ec4b9a51b3f8895b501.pdf?index=trueIn PDF document text
    • http://venonoval.rf.gd/dungeons_and_dragons_character_sheet_3.5.pdfIn PDF document text
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_e59e0b87f5c0474991f7a7891bb6d799.pdf?index=trueIn PDF document text
    • http://vojilub.rf.gd/98761637605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a007b967-7883-4674-8522-de3d89ba2bee/mexoket.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/23053496630.pdfIn PDF document text
    • http://rimadijek.rf.gd/google_chrome_offline_installer_64.pdfIn PDF document text
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_870579f9ba6f45529fdd1201be8ea98d.pdf?index=trueIn PDF document text
    • http://maferodo.epizy.com/bootstrap_templates_w3schools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70774765-273d-41c0-a4f7-5b99ac8fdc8d/why_has_my_ice_maker_stopped_working.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_off0000faff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFF 5588 bytes
SHA-256: f46f4599c5bf3660f8e44ed44a1726c6fb06c76a4d3279c98cd92d107ca18757
font_01_sfnt_off00010dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDE 11168 bytes
SHA-256: 9e6e8f4135d1227d6691d9deb022646029553b80969aa3b9835844edbb316b6c