Malicious PDF — malware analysis report

Static analysis result for SHA-256 615f338c61ecde52…

MALICIOUS

PDF

76.9 KB Created: 2021-02-22 08:49:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3b724fa62dc0932122ae1a05dadce075 SHA-1: 78f5545dcefadf1288b67ef11d4b95656008313b SHA-256: 615f338c61ecde529822b8c867cbf20613336d69b7d5d14f7910c646535db353
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a significant number of external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URLs identified are druttle.ru and a Weebly hosted PDF, suggesting an attempt to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and heuristics point towards a malicious document designed for redirection.

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 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.
  • 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://druttle.ru/123?utm_term=what+is+in+the+beyond+sausage+sandwich+at+dunkin+donuts PDF link annotation
    • https://bonitolopulako.weebly.com/uploads/1/3/1/3/131384654/pakedovinesaxuj_kigef.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/fNpTbhz/lulujubotale.pdfIn PDF document text
    • https://cdn.sqhk.co/jitolado/gjjegf1/90_s_music_rap_and_r_b.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/op1iihh/15976062775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499285/normal_6026613b81225.pdfIn PDF document text
    • https://bivixogerixud.weebly.com/uploads/1/3/4/4/134469213/belokowo.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/2RZQtib/transport_tycoon_2_rotate_building.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/ZChhcha/dewajuliga.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://s3.amazonaws.com/kozibowisenatu/37696204288.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/gisobawavoriwuluvokulow.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/android_notification_bar_auto_hide.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/punidakukujob.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/donner_lake_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/xepevejilexomapofimovita.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/62669891687.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_off0000df02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF02 5364 bytes
SHA-256: 468fcd9439cca8194d772df91e2668a70755d64efd7dc767a588d84dc410a64c
font_01_sfnt_off0000f14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 11160 bytes
SHA-256: e2e965bacb5905f061eb553a36b00187b7f30f0072896c564bb9ad5bd82fbb90
font_02_sfnt_off000117ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AE 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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