Malicious PDF — malware analysis report

Static analysis result for SHA-256 be032f90e1210210…

MALICIOUS

PDF

70.2 KB Created: 2021-01-23 05:16:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a2612914cd5dbc2bb5930d0f0dfa93d9 SHA-1: 864efc16cf11c6bc626a3fe319c2af934ab9f359 SHA-256: be032f90e1210210ec771fbf0f23cb8f4d56af304b43bc756f50bf351475c9b5
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan distribution attempt. The document contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to host malicious content or redirect users to phishing sites. The primary malicious URL identified is jottigo.ru, which is likely used to serve the next stage of the attack.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/aws?utm_term=english+grammar+practice+test+with+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/ximepadogi/hhugihc/zomefifopov.pdfIn PDF document text
    • https://site-1177333.mozfiles.com/files/1177333/38151226614.pdfIn PDF document text
    • https://site-1174816.mozfiles.com/files/1174816/64422024276.pdfIn PDF document text
    • https://cdn.sqhk.co/rugofufol/jdijnRo/best_open_world_driving_games_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/dhgXgei/4985699978.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/8941667.pdfIn PDF document text
    • https://cdn.sqhk.co/kenujowemi/ljdDiew/gagajaratuwulenowisilod.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/jfiiheh/goodreads_lists_romance.pdfIn PDF document text
    • https://cdn.sqhk.co/dekaroku/VjaomQg/17233365632.pdfIn PDF document text
    • https://xelasukozulete.weebly.com/uploads/1/3/2/6/132681542/dosutetoluketa.pdfIn PDF document text
    • https://ferizovewop.weebly.com/uploads/1/3/4/8/134887996/pebuxen-zokenenunozo-lojodabekuwop-karanefukufozaw.pdfIn PDF document text
    • https://site-1176154.mozfiles.com/files/1176154/crystal_ball_monte_carlo_simulation_excel.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/paxivogedewilu/29257168907.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/37521858038.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/belafonte_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/video_from_website_mac_chrome.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/11240439715.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/xavigopexumuxufudojixu.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/52804486290.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/lovosujumobodug.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_off0000d093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD093 5620 bytes
SHA-256: edc5a67804b322836e1b49c6699f82ec8e1cc1c227a85275263b203458e87b77
font_01_sfnt_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 11124 bytes
SHA-256: 93adeacb492258d253ff6af75571e06fda775088646eb4377c0ff2c683dbc90e

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