Malicious PDF — malware analysis report

Static analysis result for SHA-256 7642639d5907f4de…

MALICIOUS

PDF

73.5 KB Created: 2021-02-28 07:12:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c2d783c60bc3f901847928d951a2a3da SHA-1: b77f2ecaa1004f644df92baaedef10cec46d16be SHA-256: 7642639d5907f4de4abaf6d0c484f09730ab71b6a1653e45d56163aa2527017f
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/award?keyword=python+project+structure+example+github PDF link annotation
    • http://vosajizegek.mypressonline.com/96697117966.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/how_to_print_digital_paintings.pdfIn PDF document text
    • https://zodemabu.weebly.com/uploads/1/3/4/8/134896511/jupinadidewufuk_luxegukunaw.pdfIn PDF document text
    • https://linasiwafeki.weebly.com/uploads/1/3/1/3/131380288/wajufiborijiwedobu.pdfIn PDF document text
    • https://roxejozojone.weebly.com/uploads/1/3/0/9/130969259/bidunenibew.pdfIn PDF document text
    • https://widowajezow.weebly.com/uploads/1/3/4/5/134584852/kuferimapo.pdfIn PDF document text
    • https://midejunefe.weebly.com/uploads/1/3/5/4/135400465/4a87e67ccf.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/price_action_scalping_download.pdfIn PDF document text
    • https://mogewojelepa.weebly.com/uploads/1/3/4/6/134681452/buwavomuxiropixabota.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/what_is_dataset_object_mcq.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/wutezigojuxi/bach_cello_suite_2_prelude_sheet_music.pdfIn PDF document text
    • http://zevusup.atwebpages.com/surah_mulk_text_in_arabic.pdfIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/69997580005.pdfIn PDF document text
    • http://bagugexasorip.myartsonline.com/how_to_test_cranial_nerves_in_infants.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/map_of_the_world_with_country_names_and_capitals.pdfIn PDF document text
    • http://tebaputazaxuva.myartsonline.com/88168367965.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/what_causes_eye_blood_clot.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_off0000e3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A3 5732 bytes
SHA-256: c166736fef8c478808e17f9fa52205b877a7fe934b55fab4caa7785e8e941608
font_01_sfnt_off0000f709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 9904 bytes
SHA-256: 1302678cf6d3bee147c0ad2319f2490f02ed4959e32bc0424285c58947bd8e76

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