Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1465b3f0bed3c44…

MALICIOUS

PDF

72.8 KB Created: 2021-01-17 17:44:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 509ee1f5dec95b9967b574573b23efb8 SHA-1: 106e34966c2dbeef4f3287be6d9580eca2801790 SHA-256: a1465b3f0bed3c4402f0e86901be9b1ed15dcac9ffc938bc54c475b538e14183
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by multiple engines, including ClamAV, and flagged by an ML classifier. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('trafftec.ru') and another to a link farm on disposable hosting. The PDF structure and embedded content suggest it is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://trafftec.ru/123?utm_term=citing+the+apa+code+of+ethics PDF link annotation
    • https://site-1234129.mozfiles.com/files/1234129/yahoo_answers_home.pdfIn PDF document text
    • https://site-1177018.mozfiles.com/files/1177018/water_shooting_arcade_game_app.pdfIn PDF document text
    • http://zuvakaxosamota.22web.org/ararara_marathi_song_vipmarathi.pdfIn PDF document text
    • https://site-1168003.mozfiles.com/files/1168003/79059434108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391013/normal_5fb5c9e43a322.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416934/normal_6002709f0b673.pdfIn PDF document text
    • http://kadesevi.iblogger.org/compound_interest_problem_solving_worksheet.pdfIn PDF document text
    • http://remumajisipiv.66ghz.com/39992126633.pdfIn PDF document text
    • https://site-1244434.mozfiles.com/files/1244434/fivisobuzepuwel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jedadokuti/organizational_chart_template_in_word_2013.pdfIn PDF document text
    • http://xumugipetoje.epizy.com/44503807733.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/adobe_illustrator_board_game_template.pdfIn PDF document text
    • http://nugafafekovad.epizy.com/game_perang_android_mod_apk_offline.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EC 5100 bytes
SHA-256: f8097ce357dfee35cd9efcb1111a5ce888c1c22eb7d99b5f6ec725b760c35de9
font_01_sfnt_off0000e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 10268 bytes
SHA-256: 8415c9309ef1647f548476963b3138eb8da6fab6f71c292efa43f218013eb2b7
font_02_sfnt_off00010839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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