Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5c6b5f3e5b3c9b…

MALICIOUS

PDF

76.0 KB Created: 2021-03-25 15:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fd2e7c4434003738a19241e5aa8fae1f SHA-1: 25b98a64d214c381490f3a812a1e1af4b607d122 SHA-256: 1b5c6b5f3e5b3c9ba97a40c53f45f6432a0c8a7cc8e63ed40cd9f062f3a69abb
184 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector and a link farm. Several embedded URLs point to suspicious or known malicious domains, indicating a phishing or scam attempt. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=folding+adirondack+chair+plans+free+pdf In PDF document text
    • http://azules.ru/night_shift_cast_season_4_episode_10c23gg.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/EjghfkA/67385269147.pdfIn PDF document text
    • http://psychologyrelax.xyz/what_size_is_a_pack_n_play_mattressutrh2.pdfIn PDF document text
    • http://zanartcc.net/bejowanibodazituve7g3w.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/7jjjigj/selena_tips_and_tricks_mobile_legends.pdfIn PDF document text
    • http://kyponnik.online/mekivawubogaliwegiwiwizabqeg8x.pdfIn PDF document text
    • http://pedron.fun/28622338606yrh0u.pdfIn PDF document text
    • http://game-pro.xyz/66070145539f57xg.pdfIn PDF document text
    • http://detonicufficiale.website/2d_barcode_generator417urdss.pdfIn PDF document text
    • http://thedefenseforge.com/opengl_superbible_githubnjdrp.pdfIn PDF document text
    • http://tortomsk.ru/91315473540g3vt6.pdfIn PDF document text
    • http://gatorama.site/mosakejomevazojatalum1opgl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7407ca27-3943-40da-a9e1-ca985c55482c/verbos_regulares_e_irregulares_en_presente_pasado_y_futuro_en_ingles_y_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/90434013297.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/acta_neuropathologica_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77716f83-ca55-4e4a-a242-ad8418a4fab5/the_beths_band_facebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d180c8d0-f58f-464e-b4c5-d6d265860a7b/5319058232.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/format_in_writing_radio_broadcasting_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c80f87e-9a65-4527-808a-819d73c46e90/5_languages_of_love_audiobook_download_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/pojimusimerezikaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af4908e-7a21-435a-890c-2c5d1f9f9bb4/zodasuwuzamabaxutezo.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_off0000ea2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2C 5436 bytes
SHA-256: e1756c6a267ec9872d632984945f63080c698457922e9321f48da2aeca2f086b
font_01_sfnt_off0000fcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAA 11032 bytes
SHA-256: 73136c56fb9fcd011285b78cc2a87ea8ae26b35c1fd56a887978ffc26d8d9222

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