Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad437ccf5f0182f0…

MALICIOUS

PDF

79.1 KB Created: 2021-03-20 04:20:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 62c79adecda55eb3e72ef536d9937e48 SHA-1: 130b7cc47401aadf094b3a959822a1c367e2e072 SHA-256: ad437ccf5f0182f071bd0ccf37a1c075d51b094eb6405c31f2b166cb54e4033b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting and appear to be part of a link farm designed to manipulate search engine results. One prominent URL, 'https://bologen.ru/wix?keyword=screen+recorder+apk+download+for+android+4.4.4', suggests a lure for downloading software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/wix?keyword=screen+recorder+apk+download+for+android+4.4.4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481515/normal_604f81bb96193.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/fijhhge/how_to_win_lucky_duck_slots.pdfIn PDF document text
    • https://cdn.sqhk.co/rasetiwulipu/ehhYxfJ/2020_my_country_bridge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478961/normal_6054bbce690b8.pdfIn PDF document text
    • http://leomannapov.com/mosixz7ypz.pdfIn PDF document text
    • https://cdn.sqhk.co/vegedusovo/hb8BuHF/luzuforupakalifin.pdfIn PDF document text
    • https://xunopigiwigon.weebly.com/uploads/1/3/1/6/131636761/838713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468827/normal_6024a934457cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452862/normal_60293ddee5dac.pdfIn PDF document text
    • https://zowukudikumo.weebly.com/uploads/1/3/1/3/131382828/6ba62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446494/normal_604b86f1bbb22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482191/normal_601138389dca6.pdfIn PDF document text
    • https://falatunasozenu.weebly.com/uploads/1/3/4/7/134762474/suriganov.pdfIn PDF document text
    • https://cdn.sqhk.co/kevekelobivo/jcoijkD/angie_s_list_phone_number.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387813/normal_5febf6d127f38.pdfIn PDF document text
    • https://cdn.sqhk.co/jukowejazus/gdgipge/gawog.pdfIn PDF document text
    • http://servisvds.ru/wizedorukidagaseqrian.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/golepe/pc_bluetooth_free_connect_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/towoxavagig.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/casdon_-_dyson_ball_vacuum_toy_vacuum_with_working_suction_and_sounds_2_lbs_grey_yellow_multicolor.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/do_tomatoes_grow_all_year.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_off0000f835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 5348 bytes
SHA-256: 121d615eb1c323a92acc0bf3b9796e656f4358925deeeab18620593a8bc973d2
font_01_sfnt_off00010a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A98 10584 bytes
SHA-256: f21047b719926a01f46a99148fdb2a12655da3a687d6dc9535ff8aba399b4cae

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