Malicious PDF — malware analysis report

Static analysis result for SHA-256 3edecf30317b3368…

MALICIOUS

PDF

75.0 KB Created: 2021-05-13 19:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 56fac67ba1bbaeeb5fc11691a1383b78 SHA-1: 3ee1abe807e78d0f3070b80ce1b4682639709e00 SHA-256: 3edecf30317b336852aa6305b8c2f905b4f2ab6fd459db99a3cd5c949f686ef6
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 one prominent URL pointing to 'golowaki.ru' and disguised with a 'wireless gsm alarm system setup' term, suggesting a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further supporting a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=wireless+gsm+alarm+system+setup PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375699/normal_603a8c2120ac5.pdfIn PDF document text
    • https://zabugejagovim.weebly.com/uploads/1/3/1/6/131637755/7c8e321469.pdfIn PDF document text
    • http://xokodiraki.22web.org/days_of_the_week_in_arabic.pdfIn PDF document text
    • http://jizelelagu.iblogger.org/30758141711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450636/normal_6042444c2c802.pdfIn PDF document text
    • https://lejawoxaniw.weebly.com/uploads/1/3/0/7/130738778/06878.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/GEjcgjb/city_car_driving_download_pc_demo.pdfIn PDF document text
    • https://cdn.sqhk.co/jelivapizivo/ijiiggM/puroro.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/dungeons_and_dragons_online_playable_races.pdfIn PDF document text
    • http://neridofufuleteg.scienceontheweb.net/library_cataloguing_practice.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/eHxjjjh/top_free_usa_dating_apps.pdfIn PDF document text
    • https://lamipakowoj.weebly.com/uploads/1/3/2/8/132814468/1319315.pdfIn PDF document text
    • https://tavabaxo.weebly.com/uploads/1/3/1/0/131071290/7630387.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/gqihcK8/huawei_p10_lite_android_8._0.pdfIn PDF document text
    • https://jozeturibunoza.weebly.com/uploads/1/3/4/4/134491641/c9850.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/83521220-89c7-48d8-9ada-f76ad8973706/one_touch_ultra_2_test_strips_how_to_use.pdfIn PDF document text
    • http://batogegimuwew.rf.gd/how_to_use_excel_basics.pdfIn PDF document text
    • http://tedizixulore.epizy.com/catalogo_avon_15_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52f6f7ff-d617-4806-95b5-e60518e707e9/7900697778.pdfIn PDF document text
    • http://giwupaw.epizy.com/fafepetadafasosipemaf.pdfIn PDF document text
    • http://betakudo.atwebpages.com/vajajaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8bbd507-f595-44e1-a214-f8c9cbb6acef/mijurexir.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_off0000e6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A1 5256 bytes
SHA-256: fcc0983d6e73dc35a63d8a78bb5e33732145b301f39db45c1636099326856311
font_01_sfnt_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 10820 bytes
SHA-256: 251adb4bf8518437627761ac4513f5345a3c0d2cf58a56e82340568accd8d239

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