Malicious PDF — malware analysis report

Static analysis result for SHA-256 61cbbf14e8f196b7…

MALICIOUS

PDF

93.1 KB Created: 2021-05-07 08:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9c1f432c1d7b01afda4b6b52e286c979 SHA-1: 4cea536f53a51866bf9714ff10cb0380952dc07a SHA-256: 61cbbf14e8f196b7608f3030d0d9590556cdfd9da2273be9b7fef441fd6d0a83
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links hosted on disposable infrastructure, suggesting an attempt to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=beats+solo+3+wireless+charger In PDF document text
    • http://myluckywin.site/how_do_i_change_my_ip_address_on_windows_1017r81.pdfIn PDF document text
    • http://getcreditreport.info/eating_attitudes_test_269gb9l.pdfIn PDF document text
    • http://ruszaimclub.ru/battleship_board_game_freeawauy.pdfIn PDF document text
    • https://cdn.sqhk.co/jizapamilizo/jeshgjf/cbr_test_practical.pdfIn PDF document text
    • http://fakts.design/tls_tunnel_premium_apkq9u3a.pdfIn PDF document text
    • http://erogan24.website/libros_cristianos_para_mujeres_gratisfkj7s.pdfIn PDF document text
    • http://contact-git.top/can_i_buy_a_universal_remote_for_my_tcl_roku_tvnvny3.pdfIn PDF document text
    • http://nasty666.space/six_of_crowsq86io.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/hfhijhM/22063647421.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://770603ce-cae8-48b7-b4e8-6e15b9dac1cd.filesusr.com/ugd/e975af_e7d74fc65de74896b14773d3520cf018.pdf?index=trueIn PDF document text
    • http://zagofij.onlinewebshop.net/mean_median_mode_printable_worksheets.pdfIn PDF document text
    • http://rojanesifilagu.myartsonline.com/widafefojugukafuxotekuziv.pdfIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_8adcf97d045a46a1a4cb2b8ad2026506.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/58d91970-df6e-417c-b42c-9ef8a78a5ae2/what_kind_of_battery_does_g-shock_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f0b4ccc-b4fa-4af0-a100-a871c82e40be/diy_racing_cockpit_plans.pdfIn PDF document text
    • http://zepizevut.atwebpages.com/64813732662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c20f589d-5565-4f24-86c1-d9359913c6f6/84788227071.pdfIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_a2ee1edde5f7457197558a0fc1ffd3cf.pdf?index=trueIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_d2e706671d6344589395fdf484e6aaf4.pdf?index=trueIn 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001171e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1171E 15480 bytes
SHA-256: dd6218549d512d0480f4047dd0273c421fc1841949ee9ef7978300e3acbd7b9d
font_00_sfnt_off000104d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D8 5364 bytes
SHA-256: bbdb76c0561edf243d66421c8aa20ec9748b457d1a448532e87fc4d0e64b8603
font_02_sfnt_off00014225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14225 10576 bytes
SHA-256: c98da7fd5113d58bcef53e2d6fa3c7d5f60bd98d1db3bab8a99bb6bbc629d81d