Malicious PDF — malware analysis report

Static analysis result for SHA-256 548b3bf86ca775b7…

MALICIOUS

PDF

81.3 KB Created: 2021-04-03 21:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7c50c12b36fc5a0c0b529c3ad39c1a53 SHA-1: 86e89a021086c0af550abf8118adba7adcd5ccb2 SHA-256: 548b3bf86ca775b71220706d20f8ac6b0497bb06d570f93eaed37adb86d8c85f
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, two of which point to suspicious domains that are likely used to host malicious content or redirect users to phishing sites. The presence of these external links suggests an attempt to direct the user away from the document to a compromised or malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=the+sense+of+an+ending+book+plot PDF link annotation
    • http://katorewudejizut.22web.org/shoulder_bursitis_exercises_kaiser.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426072/normal_5fe2ae2354183.pdfIn PDF document text
    • https://zedowegekinusil.weebly.com/uploads/1/3/3/9/133997302/3664340.pdfIn PDF document text
    • https://zafasasuk.weebly.com/uploads/1/3/4/7/134713251/divozoxa_nuvuk_vokijavajigusi_ziwajut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387701/normal_5fcd5e99efaa7.pdfIn PDF document text
    • http://xojitufos.66ghz.com/new_york_travel_guide_free.pdfIn PDF document text
    • https://lezafopiga.weebly.com/uploads/1/3/4/6/134628758/4b6c459fa28.pdfIn PDF document text
    • http://nuvuxek.iblogger.org/saucony_guide_iso_vs_hurricane_iso_3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_60356085bd47a.pdfIn PDF document text
    • http://kukikifo.iblogger.org/aristois_1._13._2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448986/normal_600a3e1245c15.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/julexekubaj/minecraft_hypixel_skyblock_fishing_guide.pdfIn PDF document text
    • http://vugikalijuboxo.epizy.com/notepad_plugin_manager_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/fetepesese.pdfIn PDF document text
    • http://fibedul.rf.gd/94271739273.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_off000100ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 5360 bytes
SHA-256: 7379927f1703e1691a1ddb5bb2e39429b7564bc4f13efb86c3265d8a187d1df3
font_01_sfnt_off000112e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E0 11040 bytes
SHA-256: c462e3aac2345cfbfef2605dd4ee7c7550c7dec044734cd657e414874b7a17af

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