Malicious PDF — malware analysis report

Static analysis result for SHA-256 97fe3443e46b8312…

MALICIOUS

PDF

70.3 KB Created: 2020-12-19 08:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 26912654e450ac9104098e5b8565a0be SHA-1: 115e8019088d51603c37feaeca0cd85dda23a026 SHA-256: 97fe3443e46b8312fcdb5e0892fd85d928d1507a619ee9626fd165a3d645beee
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://traffking.ru/strik?utm_term=child+of+a+mad+god+goodreads PDF link annotation
    • https://tolawururajetam.weebly.com/uploads/1/3/4/8/134883146/detoto.pdfIn PDF document text
    • https://kesamitowusiniw.weebly.com/uploads/1/3/4/4/134441112/zujowosew.pdfIn PDF document text
    • https://neluposu.weebly.com/uploads/1/3/4/3/134369170/kovan-wisinuzo.pdfIn PDF document text
    • https://fegodapu.weebly.com/uploads/1/3/0/7/130775911/6689424.pdfIn PDF document text
    • https://lexawuvake.weebly.com/uploads/1/3/4/6/134610488/6628171.pdfIn PDF document text
    • https://gikoberi.weebly.com/uploads/1/3/0/9/130969260/eceffc19c30.pdfIn PDF document text
    • https://konanofekevofi.weebly.com/uploads/1/3/4/3/134367310/5706195.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/xufujofaleki/literal_equations_coloring_activity_answers_key.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/messenger_lite_apk_uptodown_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/bevars_audio_naa_songs.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54025405d5340f34641f1/t/5fc6d4eac7c45a5eaf93ee45/1606866157443/jesiti.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_off0000d841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD841 5228 bytes
SHA-256: e633b183f391b33931c0e915f1c813d1a4cfe0d56a57affc8b51e0ddbf635b77
font_01_sfnt_off0000e9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DA 10204 bytes
SHA-256: 3680d14b6113204ca4dfcfa41a8bd40ec1c9e8606f2fce666e1564aea5004ee8

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