Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcbffbc565a384d…

MALICIOUS

PDF

74.3 KB Created: 2021-02-21 12:59:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dd8f603140a7819224eeb326db6aff73 SHA-1: 8fed42be6c112081c95930575d7e392a11e49ffa SHA-256: efcbffbc565a384d63105981e548fa6c50b7f89ac00ea50519ec42e5bdad97c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://seumenha.ru/wix?keyword=ceramic+water+dispenser+stand PDF link annotation
    • http://natlegend.space/35572747723si1qw.pdfIn PDF document text
    • http://kapusta.pro/4721014498f1hus.pdfIn PDF document text
    • http://lalat.space/zanabajetokamalejizuj0lb9e.pdfIn PDF document text
    • http://muzidos.iblogger.org/are_viruses_alive_cloze_reading_answers.pdfIn PDF document text
    • http://koolmaxt.online/kemper_profiling_amp_powerhead_bundle81nt1.pdfIn PDF document text
    • https://babanude.weebly.com/uploads/1/3/4/0/134017813/gasananagesew.pdfIn PDF document text
    • http://pugoposug.iblogger.org/61804685378.pdfIn PDF document text
    • https://rezawefid.weebly.com/uploads/1/3/5/9/135978206/84525f739a7.pdfIn PDF document text
    • http://hookup154.online/tufipogubifgkvg.pdfIn PDF document text
    • https://wusuritod.weebly.com/uploads/1/3/0/7/130739885/zorixivunu.pdfIn PDF document text
    • http://jumazuke.iblogger.org/xafugewujexalimasupi.pdfIn PDF document text
    • http://topcreditmonitoring.info/femowogazig7mzct.pdfIn PDF document text
    • http://esclub.pro/finuwileex2qz.pdfIn PDF document text
    • http://awpmode.com/38038478404vwh0u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pavebutom.epizy.com/dafimubogobok.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/12506730514.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/abstract_reasoning_test_with_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_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 5184 bytes
SHA-256: b7df33ec2fd8e7762734414493444e6dfcfbe4771539060d3c91b5216491a4be
font_01_sfnt_off0000f74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 10780 bytes
SHA-256: 8a292217b67bb695edf6cae740a6e94abc56548aabf9aaea0b2456c6d8626c25

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