Malicious PDF — malware analysis report

Static analysis result for SHA-256 1236a5a1f0d1c384…

MALICIOUS

PDF

73.0 KB Created: 2021-02-11 15:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 9a660a60ae8aa4e507b7b7a7544104b1 SHA-1: d534f01036bdc12aa7a915d07978fb9ee0ae64a3 SHA-256: 1236a5a1f0d1c3847c6c2e855218abc1636bdbd6d89ff5fcf186034580af4a1f
134 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'non mendelian genetics practice packet answers key' to entice users to click on malicious links. The presence of multiple disposable domains and link farm heuristics further indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=non+mendelian+genetics+practice+packet+answers+key PDF link annotation
    • https://cdn.sqhk.co/dorejewibiz/jcM0jgk/long_acrylic_nails_square.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/jhfoQjf/47131937347.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/california_king_bed_sheets_targetggd8t.pdfIn PDF document text
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/tulefipugazugew-waperuge-demiwib-xagizi.pdfIn PDF document text
    • https://jonolepazom.weebly.com/uploads/1/3/4/5/134520471/7842461.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/lasajij.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojiranat/hiEXpNT/rojubolafifinudorasovonez.pdfIn PDF document text
    • http://buytoday.cc/90728403983nmwwt.pdfIn PDF document text
    • http://coolmag.biz/dolphin_emulator_apk_for_ios7rus0.pdfIn PDF document text
    • http://erethiztzj.space/54706850669blji5.pdfIn PDF document text
    • https://betutoza.weebly.com/uploads/1/3/4/8/134899773/43528cc4395.pdfIn PDF document text
    • http://zdorovienashevse.xyz/mp3_download_music_downloader_songs_player_apk0b5mq.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/ipWjaie/electric_bikes_near_me_for_sale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nabotiwufonego.epizy.com/shipping_label_template_pages.pdfIn PDF document text
    • http://dupikupujetilu.rf.gd/zonebigilojifepejope.pdfIn PDF document text
    • http://jujimewukekupur.epizy.com/80792516316.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_off0000dfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD4 5620 bytes
SHA-256: fc564fcae3989df41456cc40d47b40ae17e7b10ae10c1f57cd003814c3964a02
font_01_sfnt_off0000f303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF303 10560 bytes
SHA-256: da094b4da3a9c92ef00e24cc8b5ed873a0017be8537378ba9519a222950e1cc8

Open this report in the interactive analyzer, or submit your own file for analysis.