Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b337a0e8830aa6…

MALICIOUS

PDF

67.7 KB Created: 2021-03-22 09:46:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5923f69105a1f77857f56f2a84ff8820 SHA-1: e1c6195a168b59c259bd6c404264815af3a2d549 SHA-256: 52b337a0e8830aa6b00d986532220d01de8b6a5618c4c6fc6a87c080bacd303b
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting services and are likely part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown reputation URLs strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file, indicating it's likely a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/wix?keyword=the+crucible+background+quiz
    • https://cdn.sqhk.co/paxelababeg/hhihhha/monster_hunter_generations_ultimate_key_quests_low_rank.pdf
    • http://gejulavofanutar.mygamesonline.org/coway_ap-1512hh_review.pdf
    • https://wugoxuvalego.weebly.com/uploads/1/3/4/0/134017666/802d8b0b6.pdf
    • https://dagaroxir.weebly.com/uploads/1/3/5/9/135973008/e43ada42ee.pdf
    • http://mamubisuk.mypressonline.com/park_pediatric_cardiology_download.pdf
    • https://wudegilunukoga.weebly.com/uploads/1/3/1/3/131379548/xogaw_gafovisezonib_wagusikilobil.pdf
    • http://bajifepeselok.sportsontheweb.net/troy_bilt_tb230_air_filter.pdf
    • https://cdn.sqhk.co/tipefima/AgdbVhf/gijuzutakorelogodaloxofu.pdf
    • https://cdn.sqhk.co/fazofasufiwu/jchhAHq/business_continuity_plan_template_uk_free.pdf
    • https://cdn-cms.f-static.net/uploads/4492240/normal_60194d5d92384.pdf
    • https://nokemodikobo.weebly.com/uploads/1/3/4/3/134308311/15bd25.pdf
    • https://cdn.sqhk.co/tonufipu/igZjegd/gluten_free_lemon_poppy_seed_bundt_cake_recipe.pdf
    • http://wivaserana.mywebcommunity.org/85094474060.pdf
    • https://cdn-cms.f-static.net/uploads/4383165/normal_601a389575ed3.pdf
    • https://cdn.sqhk.co/nazutupim/gfPhc2U/best_book_on_history_of_religion.pdf
    • https://fanolukexepafo.weebly.com/uploads/1/3/0/9/130969893/460232.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4e0c96dd-c244-4deb-b7fa-57ac0afdec36/network_security_key_for_airtel_4g_hotspot.pdf
    • http://sijadogif.atwebpages.com/35916158315.pdf
    • https://s3.amazonaws.com/xotomisen/tuviza.pdf
    • https://s3.amazonaws.com/wupuxus/fifty_shades_freed_soundtrack_song_list.pdf
    • https://uploads.strikinglycdn.com/files/753f0414-6ee0-41d0-81c8-2acb5282d1ec/how_to_pass_comptia_network_exam.pdf
    • https://s3.amazonaws.com/padosumifubobo/deuterated_chloroform_solubility_in_water.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca8b.bin
9043e7ae1afd216e03fee144d4893109d3efe29c1b149a9082be3bba158b667f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8B 5352 bytes
font_01_sfnt_off0000dcb1.bin
18cefa66a6572a50d3720fb8cc105d429fd87c54a75d072a8bc9eb5d9e7723f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB1 10312 bytes

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