Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf57c30f75693bf…

MALICIOUS

PDF

79.2 KB Created: 2021-04-06 02:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: dc93b24aad3756e130626583d6d9f74a SHA-1: ed355c17d0bf1eddc257016058e9fcab70335ae0 SHA-256: bcf57c30f75693bfe691e806add797d9e204f37a97e2a6728c6ae9f97f559e0d
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, as malicious. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the 'link farm' heuristic indicate an attempt to distribute further malicious payloads or phishing content.

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://gimoguvi.ru/123?utm_term=colonial+america+worksheets+5th+grade PDF link annotation
    • http://jekenufakewe.mypressonline.com/56604526652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413462/normal_5fe60c4923d61.pdfIn PDF document text
    • https://zitakutuseg.weebly.com/uploads/1/3/5/9/135994262/47df2eefe82.pdfIn PDF document text
    • http://creamspait.xyz/giwosudafitajiluhloxz.pdfIn PDF document text
    • https://werafapotavide.weebly.com/uploads/1/3/0/9/130969473/4745399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483610/normal_60479619ebac3.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/pafabukugasos.pdfIn PDF document text
    • http://help-violation.com/1341291779229q4b.pdfIn PDF document text
    • http://bet-info.ru/sql_server_2014_trial_versionwk8cq.pdfIn PDF document text
    • https://nogekapufininut.weebly.com/uploads/1/3/3/9/133997605/6d78c.pdfIn PDF document text
    • https://kumeboxisadinur.weebly.com/uploads/1/3/4/6/134684257/530ecd17ae1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370777/normal_6068992ff0a65.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://uploads.strikinglycdn.com/files/6daf023c-f090-4aca-abce-7f47f8177654/daninaselakakiz.pdfIn PDF document text
    • http://kesolimasakifi.myartsonline.com/business_analytics_certification_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a517a2b9-bf88-401b-b811-038283d73d00/nulemenojapejijevolegaz.pdfIn PDF document text
    • http://xazasanedaned.epizy.com/72473672696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e532498-c37c-4aa4-a953-fc0e8b407569/is_the_japanese_stock_market_open_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cc6ea2a-b853-4d9a-9cee-652f3215fc74/6205991239.pdfIn PDF document text
    • http://nubusuturatiwu.rf.gd/academic_words.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_off0000ea0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 5444 bytes
SHA-256: c47beee55016e0213206bfb4d018e2ddc2d6b0c5877b24b01495137b7cb4eb17
font_01_sfnt_off0000fc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC70 10912 bytes
SHA-256: d9df77b1ff2c0270b2d72078edcf5959cb7e2c3b37d013c01b26eb2f09dc7b44
font_02_sfnt_off00012197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12197 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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