Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed65c1bf429456ef…

MALICIOUS

PDF

76.1 KB Created: 2021-06-09 01:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a84dd5f954ced3caf63cbef490a770bc SHA-1: 26f18b17237e1e1f12f34c30d8952b010c0aa68e SHA-256: ed65c1bf429456efc0153880cb7c9681ea8df573c31bda010a72c24f113e1ddd
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary external URI pointing to a suspicious domain that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to 'gallery vault pro apk download', suggesting a lure for users seeking software. No scripts were extracted, but the overall structure and URL usage indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://synerhu.ru/pbw?utm_term=gallery+vault+pro+apk+download+latest+version PDF link annotation
    • https://wipolupenigikof.weebly.com/uploads/1/3/2/7/132712614/b39726271dc.pdfIn PDF document text
    • https://mipijanifubu.weebly.com/uploads/1/3/0/7/130739658/wujosib.pdfIn PDF document text
    • https://gavizule.weebly.com/uploads/1/3/4/6/134659779/kerolirefu_jokeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kufavuva.pbworks.com/f/tefal_clipso_pressure_cooker_replacement_parts.pdfIn PDF document text
    • http://guwodav.pbworks.com/f/describe_the_life_cycle_of_rhizopus_stolonifer.pdfIn PDF document text
    • http://dupalalo.pbworks.com/f/ballance_telecharger_le_jeu_gratuit_candy_crush.pdfIn PDF document text
    • http://nolumemonip.pbworks.com/f/how_to_relieve_sciatic_nerve_pain_in_back.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/how_to_make_a_cv_europass.pdfIn PDF document text
    • http://zofurutatag.pbworks.com/w/file/fetch/144731487/21317805433.pdfIn PDF document text
    • http://legesir.pbworks.com/f/what_is_indirect_democracy_give_an_example.pdfIn PDF document text
    • http://vedufid.pbworks.com/f/nenujafogenoxawukuxog.pdfIn PDF document text
    • http://legesir.pbworks.com/w/file/fetch/144718833/five_nights_at_freddys_4_download_ocean_of_games.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/w/file/fetch/144800910/35425511514.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144608337/what_are_the_responsibilities_of_a_medical_administrative_assistant.pdfIn PDF document text
    • http://bujolajoxek.pbworks.com/f/arabic_alphabet_worksheets_for_kindergarten.pdfIn PDF document text
    • http://wikifuvuz.pbworks.com/f/how_to_get_custom_skins_on_minecraft_xbox_one_2020_for_free.pdfIn PDF document text
    • http://favakiwosut.pbworks.com/w/file/fetch/144898863/qureka_pro_hack.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_off0000e890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE890 5304 bytes
SHA-256: 2419ec8caf58f650fe55cf26cf40e967e6716b636e5bdf42019605f22f9bf44c
font_01_sfnt_off0000fac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC9 11148 bytes
SHA-256: 783b9839f76bb8547867ec9dc5dbb8f3f57d200291259b5cf5ee4b7b37157b0c

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