Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ffae4672b39efb…

MALICIOUS

PDF

76.8 KB Created: 2021-02-27 10:58:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8f00faac50e47b992eb060a92a688cad SHA-1: 70ea704b7357322dc2463d596f925394404d9b02 SHA-256: c3ffae4672b39efbd660b722e1afb547706f8368f854b76c4f3049c162d48cb8
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The document body, though partially corrupted, appears to be a lure for a free PDF, likely to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://vilenefex.ru/award?keyword=the+animator%2527s+survival+kit+pdf+espa%25C3%25B1ol+gratis PDF link annotation
    • https://cdn.sqhk.co/libavesonon/ggcSyGb/hollow_ball_of_cells_called_the_blastocyst.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/iw0xdZs/21538114320.pdfIn PDF document text
    • https://cdn.sqhk.co/zolulesar/qhjifgf/50928851532.pdfIn PDF document text
    • https://fujikoxeloto.weebly.com/uploads/1/3/5/3/135307408/juvamilokap-wagejiwaxurowi-balipanavul-fediwokevevefok.pdfIn PDF document text
    • https://cdn.sqhk.co/porekige/Q2Agggi/maze_runner_book_3_common_sense_media.pdfIn PDF document text
    • https://voperupazekeko.weebly.com/uploads/1/3/4/5/134505312/pipumadariretexa.pdfIn PDF document text
    • http://podjem2.club/pelizubemlegf.pdfIn PDF document text
    • http://segikusi.22web.org/71246668325.pdfIn PDF document text
    • https://kuvijoxujav.weebly.com/uploads/1/3/4/2/134266993/9cbd2f630e371.pdfIn PDF document text
    • https://zimegusak.weebly.com/uploads/1/3/4/6/134605775/rezerer_musetajogulin_wafajulu_bawonujaxosez.pdfIn PDF document text
    • http://best-ital.fun/air_france_klm_annual_report_2017fq7xz.pdfIn PDF document text
    • https://lanujedajifita.weebly.com/uploads/1/3/1/3/131382078/48a2364a379f75.pdfIn PDF document text
    • http://dashcamtopbest.com/45275091958jmg9r.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/java_enterprise_in_a_nutshell_3rd_edition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xibiwoziveva.epizy.com/51916676917.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/88694686242.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_off0000ed7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 5776 bytes
SHA-256: d073ee4f8ac20fef0480337fe6d06529d73d3cec671b6c5dc9f1eb2188a0e17e
font_01_sfnt_off000100cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CC 10304 bytes
SHA-256: a448c7bc6de038affa515006226d650be1bbfe2c4d82dc136ea50be5a3e60f34

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