Malicious PDF — malware analysis report

Static analysis result for SHA-256 62628d25f3bc7597…

MALICIOUS

PDF

81.9 KB Created: 2021-03-19 11:28:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ce58493a8d8b9ddb56c27f6edd46d6c4 SHA-1: 780d85c39cba1fe8831b1c9d5e632de00e07cd33 SHA-256: 62628d25f3bc7597a2cdf9d9fae7f72afac6c1dc030e03559ea7c3a13a30a7af
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The primary URL, 'https://druttle.ru/strik?utm_term=ozeri+weight+scale+batteries', is presented as a search result for a specific product, indicating a phishing or spamming lure. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/strik?utm_term=ozeri+weight+scale+batteries PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412999/normal_5fdae2d1473a3.pdfIn PDF document text
    • https://xefafarorul.weebly.com/uploads/1/3/4/6/134698093/29d71c7b0a634.pdfIn PDF document text
    • https://widajuzuno.weebly.com/uploads/1/3/1/6/131637349/vevuna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406166/normal_5fd7c03ce51f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456387/normal_5fe1041c7a347.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/1387987.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471711/normal_5fded93ea7066.pdfIn PDF document text
    • https://gepadagonuvo.weebly.com/uploads/1/3/0/7/130775626/ce915ef1e4d.pdfIn PDF document text
    • https://disovipogazita.weebly.com/uploads/1/3/1/3/131398104/salage.pdfIn PDF document text
    • https://nusepetuvake.weebly.com/uploads/1/3/3/9/133997573/rozaf.pdfIn PDF document text
    • https://wasatetokis.weebly.com/uploads/1/3/4/5/134513062/f50578cefbb0068.pdfIn PDF document text
    • https://xodimazu.weebly.com/uploads/1/3/1/4/131408168/vibatubilijes_nirinemazemiziv_fenero_gawukafex.pdfIn PDF document text
    • https://novomegaweg.weebly.com/uploads/1/3/4/7/134738931/wegusebababuxadilu.pdfIn PDF document text
    • https://pafuwaron.weebly.com/uploads/1/3/4/3/134385690/fitijagusaw.pdfIn PDF document text
    • https://wobanuwu.weebly.com/uploads/1/3/5/9/135959505/6621769.pdfIn PDF document text
    • https://surujesuf.weebly.com/uploads/1/3/4/7/134773125/sixizujisomujuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jizozekawa.epizy.com/add_promo_code_to_dunkin_donuts_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65135943-d154-4f6c-acf5-6e43b0a0bd25/97494104466.pdfIn PDF document text
    • http://gifefuko.rf.gd/basketball_hoop_game_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33b4a267-4dcc-4e2b-9b9e-3abecddf99bf/whirlpool_fridge_ice_maker_not_working_but_water_does.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16818b7f-c26c-4ea4-b228-88f358d5f190/six_memos_for_the_next_millennium_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d10172e-e9a0-4d05-9cae-bd2aa57d3b0c/chief_yeoman_eval_bullets.pdfIn PDF document text
    • http://zeluzara.epizy.com/crm_software_comparison_chart_and_guide.pdfIn PDF document text
    • http://lanelasopuju.rf.gd/apache_hadoop_3_quick_start_guide_download.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_off0001023f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 5372 bytes
SHA-256: 6981ca4cde299fac016809706f7ced6656aa2dbc62c57fdf0be9b7ccb89f9ca8
font_01_sfnt_off0001149a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149A 10512 bytes
SHA-256: ffc4782193bfe13f4c703709a8cbf0fae9671b8e6c6c05306aff36d16d06299c