Malicious PDF — malware analysis report

Static analysis result for SHA-256 590637468bea157e…

MALICIOUS

PDF

72.3 KB Created: 2021-04-07 16:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 91661e80fe300ea917dd93e088bfb8b3 SHA-1: 9a62d3638e798673d71f9f0f899a7f3d5193562e SHA-256: 590637468bea157e5a8958c7fa9a9e86e1603721ee8bb3ceb4841cce5453beda
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation scheme. One of the primary external links, https://xajibur.ru/strik?utm_term=dbt+skills+training+manual+second+edition, is flagged as unknown reputation, indicating a potential distribution point for further malicious content. No scripts were extracted, but the PDF structure itself is designed to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://xajibur.ru/strik?utm_term=dbt+skills+training+manual+second+edition PDF link annotation
    • https://sozuxeboniwuk.weebly.com/uploads/1/3/1/3/131381135/lexizili_siwunabowi_povef_bowakuvibadotim.pdfIn PDF document text
    • https://varowuzogan.weebly.com/uploads/1/3/1/8/131856285/febajuzakirokogi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3ed4296-c6f4-4001-a393-376ddde22439/vejoluf.pdfIn PDF document text
    • http://morubinubifo.epizy.com/28800795920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76bd4e5f-1c34-427d-9337-64e41597c416/16877789255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9ea4e82-6a05-465a-a41c-a06c79b1f367/54490025827.pdfIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_b0589732521a45bc894b15d21487b352.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8150dd0b-4c2f-4831-819a-1e6616456efc/what_is_shear_flow_viscosity.pdfIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_2a83f171c55549f99d9c2820e6039eb7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d34b17e-d4a4-4fe9-be1d-88a585f85a3c/how_to_use_comforday_handheld_steam_cleaner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eb63726-6192-47ca-ba0e-38766ccd2cec/dyson_dc50_ball_filter.pdfIn PDF document text
    • http://liwumulexajuvi.epizy.com/nudererepejikovufotax.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/adobe_flash_video_from_website_chrome.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/vojivefotelog.pdfIn PDF document text
    • http://galinuv.rf.gd/11436998438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd915473-a866-4f19-8f5d-bf56a4055377/damebeka.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_off0000deba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBA 5464 bytes
SHA-256: be503a3917b55327a34937485943489a19552e7cfb754adddc126b279a481f65
font_01_sfnt_off0000f13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 10496 bytes
SHA-256: 8f317e33edd9b68b62b92307a8a36d04d34f3238d8fad05d0a92c42c17a9b49c

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