Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1617769430f359…

MALICIOUS

PDF

85.1 KB Created: 2021-02-10 14:35:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b937a52f3750f2facda999e56782016e SHA-1: 72a9d8de0290b3c91d88634cc3b110843e3307e6 SHA-256: 1d1617769430f3599eea3cb36ce573a7fa0ebaa016a4f44124a55e03558dcea8
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the 'link farm' heuristic indicate an attempt to redirect users to potentially harmful sites.

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://seumenha.ru/123?utm_term=parenteral+medication+calculations PDF link annotation
    • http://dilijox.22web.org/animiz_whiteboard_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383802/normal_5fda3ccecb8b0.pdfIn PDF document text
    • http://gaydating.world/biztalk_server_2016_prerequisitesb8peh.pdfIn PDF document text
    • http://1green.space/25910904185hxox2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375908/normal_600a068aeecbb.pdfIn PDF document text
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/balefevubi.pdfIn PDF document text
    • https://wijodemarivupi.weebly.com/uploads/1/3/4/8/134861972/satuxedigizikak.pdfIn PDF document text
    • https://xutonipojoneri.weebly.com/uploads/1/3/4/6/134667901/8529713.pdfIn PDF document text
    • http://xruhdfo.site/how_to_manually_update_android_tablet_osjzc6p.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/rijaliwiguvex/28345894549.pdfIn PDF document text
    • http://lepevalir.rf.gd/72852276931.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/counter_strike_source_for_windows_10.pdfIn PDF document text
    • http://zosofoladi.rf.gd/biomes_and_ecosystems_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/gs_equestrian_size_guide.pdfIn PDF document text
    • http://bomepexajusopa.epizy.com/tenses_worksheets_englishlinx.pdfIn PDF document text
    • http://dedamedasobime.epizy.com/rerirasobiremixaze.pdfIn PDF document text
    • http://joratunezawaxa.epizy.com/73097256421.pdfIn PDF document text
    • http://wutodabegaf.epizy.com/empower_b1_plus_workbook_answer_key.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_off00010fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA2 5084 bytes
SHA-256: 6819b96c1f982b3e04d8cdf571380ef2572534ae5f9e1ed4070a0b636425ab95
font_01_sfnt_off000120d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D0 11284 bytes
SHA-256: e09fdf0b9554e1c7c7f8c0b3db1316219b28e28216806008d18225629be9f372

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