Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1ccf8827d41412…

MALICIOUS

PDF

77.1 KB Created: 2021-04-05 20:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2189b5e6f05817b6fbbfd417228ffc16 SHA-1: a9b8153bd7b6ee92eb43dd252910fcd8c5713f1a SHA-256: aa1ccf8827d414125ddc0b232e89c3f37fca70f0b41a7beed889b9d87301ff88
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

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://kuzutuzo.ru/strik?utm_term=the+rules+of+chess PDF link annotation
    • https://zegarujavo.weebly.com/uploads/1/3/4/6/134667802/zeduvojuza-nepaforukejali-darewagegu.pdfIn PDF document text
    • http://vetovikaxu.mypressonline.com/zixijekewuvamuwarolonuge.pdfIn PDF document text
    • http://vaxiliwu.medianewsonline.com/king_lear_edgar_analysis.pdfIn PDF document text
    • https://nomabedipami.weebly.com/uploads/1/3/1/4/131437379/dd05b709501d.pdfIn PDF document text
    • http://tenipimutav.mywebcommunity.org/84913770034.pdfIn PDF document text
    • https://pufemomanuxisi.weebly.com/uploads/1/3/4/3/134344256/b3a2949076a354.pdfIn PDF document text
    • http://lezirumari.sportsontheweb.net/mavagidoxeme.pdfIn PDF document text
    • http://nutusugeralinet.mypressonline.com/34184187833.pdfIn PDF document text
    • http://fasoxuxesatilu.sportsontheweb.net/estrategias_de_aprendizaje_autonomo.pdfIn PDF document text
    • http://ruvikuvi.mywebcommunity.org/calendrier_biodynamique_2020.pdfIn PDF document text
    • http://spencermcman.us/top_10_slow_rock_songs_ever8j55h.pdfIn PDF document text
    • http://tobufupevujuma.mygamesonline.org/aldi_application_fillable.pdfIn PDF document text
    • https://wujupeduluruwuv.weebly.com/uploads/1/3/5/3/135316277/numiwe.pdfIn PDF document text
    • http://matroskin.space/felotikifituxivib31rn5.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/the_creative_curriculum_for_infants_toddlers_and_twos_individual_child_profile5swqc.pdfIn PDF document text
    • http://namedaun.fun/4525419570hsmmj.pdfIn PDF document text
    • http://operationhomeplate.com/verowetirof13tu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wudazebej.atwebpages.com/surah_yasin_rumi.pdfIn PDF document text
    • http://fazegujopazoj.atwebpages.com/ethnography_anthropology.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_off0000f2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DE 4708 bytes
SHA-256: 4a88f621b0fe0eb81784b22e9426e072bde3048dc593b60069e2ef87cc659ce8
font_01_sfnt_off000102e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E1 10768 bytes
SHA-256: 63226c5a962012ec568e6357dc12a72cb645d86b66210c6884e066fc0a738a68

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