Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e3b925427796c0…

MALICIOUS

PDF

90.0 KB Created: 2021-03-24 23:55:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 79ac0d7fa9cc49bd4d73343a0fa642cd SHA-1: 78600374eef144e2270ab1cde8e416e2f1b665c5 SHA-256: d0e3b925427796c0b7f06693bbcaf0eebfa7b4f759350d0faca3b3d5a23cc494
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to disposable hosting services and appear to be part of a link farm. The document body, though heavily obfuscated, contains text related to "how to rewrite a log equation", suggesting a lure to drive traffic to these external sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://xajibur.ru/strik?utm_term=how+to+rewrite+a+log+equation PDF link annotation
    • https://femanutokit.weebly.com/uploads/1/3/3/9/133999532/1146033.pdfIn PDF document text
    • https://nonexivibofopuv.weebly.com/uploads/1/3/4/6/134603010/xibenogewaxejop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_6041a1e1aa94a.pdfIn PDF document text
    • https://cdn.sqhk.co/videbamez/LWjgHlH/lisaguvanukewefutepigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503533/normal_6037171f83970.pdfIn PDF document text
    • https://cdn.sqhk.co/nufuwijili/iKblj45/planet_mars_time_to_orbit_the_sun.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/eIgeMhc/narixozukunez.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/cover_letter_resume_template_google_docs3qwiu.pdfIn PDF document text
    • https://jatilupek.weebly.com/uploads/1/3/4/4/134491857/tiwudatoxev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467322/normal_60266e9dd4f92.pdfIn PDF document text
    • https://tamidotojo.weebly.com/uploads/1/3/1/8/131858916/e0e4725bd11df4.pdfIn PDF document text
    • https://cdn.sqhk.co/pikukafil/ijwjehc/muzanodakumedezo.pdfIn PDF document text
    • https://dikemogegopur.weebly.com/uploads/1/3/1/4/131406608/2578455.pdfIn PDF document text
    • https://serutoposax.weebly.com/uploads/1/3/5/3/135398922/lanuzazimofiju_zosiwanifez.pdfIn PDF document text
    • https://tagipuzato.weebly.com/uploads/1/3/0/7/130776724/447e6d03c.pdfIn PDF document text
    • https://bejasesazopo.weebly.com/uploads/1/3/4/5/134512805/4302885.pdfIn PDF document text
    • https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/7708468.pdfIn PDF document text
    • https://cdn.sqhk.co/wosepimi/rhjhjTA/crew_apparel_clothes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418781/normal_602b567c0ab5d.pdfIn PDF document text
    • http://usacreditscore.info/toro_snow_blower_maintenancet3jgm.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/f2826d04-af23-42e8-8f8d-a6eea762c8a8/72665437081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d92f284-3730-4938-85a5-5f12050e352c/levevewerivulomixekim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82ee7248-11bf-4d85-ad25-507816d33d90/trimble_business_center_download_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/540cc023-2093-49ed-be26-120037d59828/vixixebibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b30dbf3-dc98-492a-9426-550f6525244d/how_to_print_from_my_iphone_to_my_wireless_dell_printer.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 4856 bytes
SHA-256: 2dc8fd1b8c1b81553a73184aa0fc9a2557988443b42d045b503b5e7bdf2165a1
font_01_sfnt_off00011d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3F 11528 bytes
SHA-256: 1c92c176e505856e90ac48c88d609b6fee85aec89624fc842dc16bf985fa7f2e
font_02_sfnt_off000144c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C2 16208 bytes
SHA-256: 560e11d5da3ed60647d844d0127c34f4fbbc0b68999cbe35161ddcd790341c9f