Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f365db56730dcb…

MALICIOUS

PDF

75.1 KB Created: 2021-03-14 19:21:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 62498c1f2a5f8cec33cd6a1b07baa4e0 SHA-1: 4c92c2d78f4a334129af4218f636d2c2e61098f7 SHA-256: a1f365db56730dcb97ee5a7603f3822214a27448ec0e73263b28b24038827efc
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://lozipotod.ru/award?keyword=lexical+categories+theory+pdf PDF link annotation
    • http://fifamarketbot.com/sudelrl8yo.pdfIn PDF document text
    • http://leree6.club/can_fe_exam_be_waived034h5.pdfIn PDF document text
    • http://helplnstagram-confirm.com/xizukoxiz8u2fk.pdfIn PDF document text
    • http://shopsupergood.site/el_principito_en_espaol_onlineeak7t.pdfIn PDF document text
    • https://vekafikag.weebly.com/uploads/1/3/5/9/135986004/826815e70.pdfIn PDF document text
    • https://cdn.sqhk.co/buwuvibija/6hfLghs/42703957190.pdfIn PDF document text
    • https://cdn.sqhk.co/widexerun/bifqidq/entergy_ms_outage.pdfIn PDF document text
    • http://cryogen.me/friday_the_13th_series_episode_guidewo4jh.pdfIn PDF document text
    • http://cafe-cok.ru/57686478656pj0bm.pdfIn PDF document text
    • http://kfcrabota.ru/26356284383b03vy.pdfIn PDF document text
    • https://palivifu.weebly.com/uploads/1/3/3/9/133986562/8115639.pdfIn PDF document text
    • https://cdn.sqhk.co/kekoseni/ja4hdl5/pocket_rally_lite_apk_mod_download.pdfIn PDF document text
    • https://nodepuje.weebly.com/uploads/1/3/4/5/134518199/kazumu.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/4c885b52-bd1a-4c86-9737-dc5ae10debf9/dell_color_laser_1320c_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e900c059-ab9d-47b8-a0f8-68af882c6f2c/dd_tabletop_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e93a385-c031-4d1b-ba03-021573eb3655/kudasewexinomalafunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4095ef4-8f72-433e-9c9f-e7350e64c522/my_name_in_chinese_symbols.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cba90d3d-9f35-4e6d-9615-8a9a1f0e7815/kanewivitugijejekix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b694fd6-34af-4f4c-a904-c274e33309cc/2200954974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52c1f598-80a0-4e32-ab3c-86d6174b3c10/56957961457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d5a0ed6-6fc6-4949-a77d-271615fd93b2/sniper_ultimate_kill_2017_movie_download_in_tamilrockers.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_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 5528 bytes
SHA-256: fda6c2bb412da6cf4b275858d3d0a5c5e47fff76f49477ceaa205be08b77bebb
font_01_sfnt_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 10848 bytes
SHA-256: e4ae8a1dbde8fd1ca9b9574a23fa43fae7ab74258fb29ed0a647ae3446533152