Malicious PDF — malware analysis report

Static analysis result for SHA-256 990b919fd8695202…

MALICIOUS

PDF

75.5 KB Created: 2021-03-05 04:14:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f0cf44555f83374ba39b2b1ae130a5bf SHA-1: a9f50c0f0434fe9921e449e0ddc690d7433df77c SHA-256: 990b919fd869520297d4e1e7f0ce51e01436d52c7103698d34b60d98a4dc7414
126 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains text related to material price variance, likely a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/award?keyword=how+to+determine+the+material+price+variance PDF link annotation
    • https://mokefogo.weebly.com/uploads/1/3/6/0/136086775/0f389b7d2f.pdfIn PDF document text
    • https://ximilebikunupi.weebly.com/uploads/1/3/4/8/134875253/jusuwibebudipun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_6014e3a66d4a2.pdfIn PDF document text
    • https://lijuvimu.weebly.com/uploads/1/3/0/7/130775306/vuxorudejimofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389384/normal_603d8da5d53d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_60153959459bc.pdfIn PDF document text
    • https://woxigixekamut.weebly.com/uploads/1/3/0/7/130739530/zuxuj_tapetunop.pdfIn PDF document text
    • https://lurugidapu.weebly.com/uploads/1/3/4/3/134315770/zivojaganev.pdfIn PDF document text
    • https://voledepegos.weebly.com/uploads/1/3/1/4/131407008/mozotaxano.pdfIn PDF document text
    • https://rebejudan.weebly.com/uploads/1/3/5/3/135316845/kuximobujuxut_gifipe.pdfIn PDF document text
    • https://tixanesel.weebly.com/uploads/1/3/4/2/134234664/jotejodadopubirux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389804/normal_5ffba0ef26b42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gewekerob.epizy.com/consumer_reports_convertible_car_seats_ratings.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/70062639149.pdfIn PDF document text
    • http://mewatubaliz.epizy.com/58004239614.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/3661646801.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/capitalism_and_socialism.pdfIn PDF document text
    • http://jolavewavesuj.epizy.com/immanuel_kant_philosophy_about_self_quora.pdfIn PDF document text
    • http://povuputuk.epizy.com/how_to_reset_firestick_remote_when_frozen.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/48998814318.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/fall_foliage_report_new_york_city.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_off0000ea27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA27 5248 bytes
SHA-256: a6e3cc0f111fbbc32e4eb65849bec476e12ea50d80038a44eab572fad7924488
font_01_sfnt_off0000fbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE7 11024 bytes
SHA-256: 35027353c674f846393687ac3507c50b7fdcd6a54d5cc0a4e09dd65ae452d814

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