Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f7cc40bd5e1535…

MALICIOUS

PDF

79.6 KB Created: 2021-04-17 14:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b6bf0c1e5b49f43b8b249da501d14815 SHA-1: 27b37e1fb7abced1741603da54c5250ad2b8b293 SHA-256: 77f7cc40bd5e153553ba247ea62d06d499b79cdf52b3fa3d076c28341c56f759
142 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including ML classification and ClamAV detection as a phishing trojan. The document body and extracted URLs suggest a lure for users to click on links, likely to download further malware or engage in phishing. The presence of embedded URLs and link farm behavior further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/strik?utm_term=can+i+get+a+replacement+id+online PDF link annotation
    • https://dufebekeromodi.weebly.com/uploads/1/3/0/7/130776386/womeponasawinuravub.pdfIn PDF document text
    • http://nukowivoxom.iblogger.org/chousar_firangi_movie_free.pdfIn PDF document text
    • https://cdn.sqhk.co/gulifunanale/iiDWZii/mobile_manager_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/miwiwefe/iaggifU/nusewaxeturusodenotaro.pdfIn PDF document text
    • http://menformula.xyz/quran_only_bangla_translationcqeq2.pdfIn PDF document text
    • https://bululuxoragoxoj.weebly.com/uploads/1/3/0/9/130969030/surakabatop_lifuxega_kotogorog_welaguvefa.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/ij6ibiN/jiwokase.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/ihPnWFq/36988242737.pdfIn PDF document text
    • https://varavedonenen.weebly.com/uploads/1/3/4/3/134316352/6213247.pdfIn PDF document text
    • https://cdn.sqhk.co/losopodelim/yijk6BK/cockpit_playseat_red_bull_racing_f1.pdfIn PDF document text
    • http://xajozixav.iblogger.org/autobiography_of_a_yogi_malayalam.pdfIn PDF document text
    • https://vowexigap.weebly.com/uploads/1/3/1/6/131636774/wibinironasezax.pdfIn PDF document text
    • http://helper-badges.com/site_de_piratage_msp_mot_de_passendsn2.pdfIn PDF document text
    • http://tafedudim.22web.org/15992147697.pdfIn PDF document text
    • http://smartcoin.design/pancreas_histologyj9kbc.pdfIn PDF document text
    • http://electriccannoz.club/575240408698sbaa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wofofuzumoju.rf.gd/vijewodewejep.pdfIn PDF document text
    • http://bezafesu.rf.gd/jufamorot.pdfIn PDF document text
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_2f6520cd85c149d8950452073983fa42.pdf?index=trueIn PDF document text
    • http://sosisime.rf.gd/28050094059.pdfIn PDF document text
    • https://1c2b20db-dbe1-4299-b4c0-f67d595d3b6c.filesusr.com/ugd/e71423_3501bd64c9ae4b54b1910889305c8849.pdf?index=trueIn PDF document text
    • http://repalisakafi.epizy.com/how_many_hours_does_it_take_to_write_a_screenplay.pdfIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_e4058ee08df843b69e162f8d5f67436a.pdf?index=trueIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_85813a07a7d848669b4f90fe1455d299.pdf?index=trueIn PDF document text
    • http://rugunazivesix.rf.gd/xufib.pdfIn PDF document text
    • https://8a05da06-75fd-4b4b-8779-f7668a2fa4a0.filesusr.com/ugd/da32d9_1e4eec62abaa402b8a78982580f79b84.pdf?index=trueIn PDF document text
    • http://sigogijukajuli.rf.gd/bible_quiz_questions_and_answers_in_malayalam.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_off0000f6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EC 5120 bytes
SHA-256: 3c0a51c913586b916f90adde54fbd4a4eaac47d13da9b167c7791401f1b40441
font_01_sfnt_off0001083e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083E 11864 bytes
SHA-256: 4fee69c70c45448a169659ae0ff7f458d1069c0e4bce5058bf124341213b2cda