Malicious PDF — malware analysis report

Static analysis result for SHA-256 1416e0f0019e16b6…

MALICIOUS

PDF

86.5 KB Created: 2021-03-22 00:30:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 16a87f276c5352c573b7fc9e3dd46f11 SHA-1: 2d55b9536dfc903acaa894d66235252b69bd1315 SHA-256: 1416e0f0019e16b62cb840347cb975e299cb100bb6c501973256a86ba4929516
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains numerous external URIs, with one prominent URL pointing to 'pelibifir.ru' and disguised with a 'utm_term' parameter suggesting a phishing lure related to backup manuals. The presence of many links on disposable hosting further supports a malicious intent, likely to redirect users to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pelibifir.ru/123?utm_term=asigra+backup+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455399/normal_605117c563bb8.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/64870966093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450727/normal_604fa37c687c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473035/normal_604cc2ff5d567.pdfIn PDF document text
    • http://sojuvofud.22web.org/31333035505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460076/normal_60208dec5fc8f.pdfIn PDF document text
    • http://fosinofabeveso.22web.org/gst_amendments_for_may_2019_inter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476782/normal_6029d885a6617.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476567/normal_5fdec78300a8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387933/normal_5ff1150e9f8a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499636/normal_5ff01695c1d21.pdfIn PDF document text
    • http://rikuximuvo.iblogger.org/anti_bullying_policy_workplace_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://datufubizut.rf.gd/ramayana_story.pdfIn PDF document text
    • http://vuxebezedigelun.onlinewebshop.net/convert_file_to_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/zojotefizurebatojemi.pdfIn PDF document text
    • http://tudugir.atwebpages.com/capacitor_capacitance.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/marieke_jacques_brel_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/47921204708.pdfIn PDF document text
    • http://futifuzofu.rf.gd/biblical_meaning_of_dreams.pdfIn PDF document text
    • http://nimozan.epizy.com/define_design_development_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/ae_form_55-_46.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/11522817898.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 5448 bytes
SHA-256: 86ef9cea5856d7cc6fabbe0191ffb07d26d360784ccc00302ad138f579a21c8d
font_01_sfnt_off000110a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A6 11004 bytes
SHA-256: 56328a4d28491cae07cc294bd27ba2a2af225f4d1ddeb72d80f16e4131bb05d9
font_02_sfnt_off0001366f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366F 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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