Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f744fd7959e821b…

MALICIOUS

PDF

93.5 KB Created: 2021-03-14 21:24:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 72c1dfe446ae4114fc0cbb8671b26fda SHA-1: bc37718a58167f1bc2f6bb4b46adf2970c0681a5 SHA-256: 4f744fd7959e821b73dd8e1017a9e091ffb85dd3f1f44d5af66eb9b3a6a07dbc
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which are hosted on disposable domains or link farms, indicating a phishing or scam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'Background powerpoint keren gratis', directing users to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/123?utm_term=background+powerpoint+keren+gratis PDF link annotation
    • https://miroguwitofenev.weebly.com/uploads/1/3/5/9/135958286/1544697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388041/normal_5fd9e3f9a1bc6.pdfIn PDF document text
    • http://alifan.store/librecad_paste_multiple_commandsedbkt.pdfIn PDF document text
    • https://cdn.sqhk.co/zujubiviv/Vhagjhb/fufuxaxigulegala.pdfIn PDF document text
    • https://sejusidanixaj.weebly.com/uploads/1/3/4/3/134374441/2e545.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/hjx5SGa/37236189104.pdfIn PDF document text
    • https://kizifafub.weebly.com/uploads/1/3/4/7/134714450/zidevofolurebed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480149/normal_5fee4fc314fb3.pdfIn PDF document text
    • http://yblda.fun/jdk_netbeans_7._3qtg5q.pdfIn PDF document text
    • https://punoburewi.weebly.com/uploads/1/3/4/3/134305970/munudonaworofap.pdfIn PDF document text
    • https://cdn.sqhk.co/rumoligodo/Vyjjjgj/cricket_colony_setup.pdfIn PDF document text
    • http://sejojus.iblogger.org/gidevilinokijazopigadaxi.pdfIn PDF document text
    • https://dugufenejoropez.weebly.com/uploads/1/3/0/7/130775504/zuvofudebuxolim-lawepenekasomif-gamolivibuka-jubedufidasi.pdfIn PDF document text
    • http://vorecan.fun/five_nights_at_freddys_bookshir3y.pdfIn PDF document text
    • https://jotavitot.weebly.com/uploads/1/3/0/7/130738821/nidiwativofisurizov.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/ijgizge/lugojowoxeliselilivivisul.pdfIn PDF document text
    • https://nibolujadi.weebly.com/uploads/1/3/1/3/131381302/lalebelatabajex_rurekixuzivaf_devibowe.pdfIn PDF document text
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/mevakibivomoguv_pawakuzujuwi_kigixuw.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/hh5kRBo/80403550788.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://favukimasinete.rf.gd/aptitude_test_sample.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_off00013122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13122 5412 bytes
SHA-256: 098f71562612e1f070e88bc3f1d31dc7d98895030aa67513f2b22ce8858b6ed6
font_01_sfnt_off000143b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B4 10768 bytes
SHA-256: 696d92e8ecfd8f40e52e8bbbb758aa4daafb302f9a541b50e24e9031a2833fca

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