Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a291d7ed6a9b82…

MALICIOUS

PDF

78.4 KB Created: 2021-05-15 21:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e4a8ed33f352edbe4455b965f40f1dae SHA-1: 75eb58219f93cd50069ad3ee8d74313f5c4c05f0 SHA-256: 43a291d7ed6a9b8275d3b739f1b4abf809f0ab486fba32ac52e0579be2171eae
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The primary URL, 'https://baarspo.ru/strik?utm_term=how+to+replace+toner+brother+hl-2280dw', suggests a lure related to printer maintenance. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

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 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://baarspo.ru/strik?utm_term=how+to+replace+toner+brother+hl-2280dw PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500668/normal_6017f99df1eb5.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/convertir_de_pulgadas_a_cms.pdfIn PDF document text
    • http://world-wild-shop.com/annabel_lee_en_espaol0t5we.pdfIn PDF document text
    • http://alania365.ru/29119129423xh1nw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443617/normal_5fdb7303c4f9b.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/do_self_cleaning_water_dispensers_work.pdfIn PDF document text
    • http://trixy-matrix.space/bladderwort_plant_informationjubqx.pdfIn PDF document text
    • http://pogadai.xyz/anker_20000_pd_manualgji6m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dolanuvusipegu.myartsonline.com/night_shift_movie_theme_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eed6316-dc23-4a7c-b9eb-640c65f2b431/fabigekuwikexike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee879971-42fa-4bcf-84f9-abe39cedae9b/online_covid_19_test_results_in_ksa.pdfIn PDF document text
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_c4c09bce9c4a4047a1bfdc0095ebb0c8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2e0c78c-ac45-4a46-b7e5-3fcf9195c69d/gi_mixer_yamaha_mg16_6fx.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/37015433462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a995d70-a9f2-40b7-a5e5-44217f4016b5/37698072742.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/best_dynamic_stretches_before_workout.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/mining_waste_disposal_methods.pdfIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_1f7e85e2123c4d9d96e06e1072bef565.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/70e6e8b8-f3b1-4bbf-9088-61d3a0d8adf6/17153482322.pdfIn PDF document text
    • https://a96990da-dd17-4b11-844c-aba2d588d1b6.filesusr.com/ugd/5e5e7b_215a08aed5dd4ff2bcdc1e4b4b4f4c75.pdf?index=trueIn 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://slickdeals.net/f/6070392-manually-resetting-the-toner-on-a-brother-hl-2280dwIn 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_off0000f032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 5676 bytes
SHA-256: 5f411c27473114619e2e838e15cfcb55e8f96326b7b1a551d0c12e4e47c381a8
font_01_sfnt_off00010385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 11772 bytes
SHA-256: 3fc780c851ee354a73f63b85192b9ed4335cae147f9ca14ca231604f37264170

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