Malicious PDF — malware analysis report

Static analysis result for SHA-256 2949a4a46fb0d3b7…

MALICIOUS

PDF

95.3 KB Created: 2021-05-30 00:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b1cb613818bcace055f39e2c00033dfe SHA-1: 2142323081e83d217f36f215f26d316015e3fa48 SHA-256: 2949a4a46fb0d3b7710833f63ba10d5619a43e2f04af1868b83465373d541eda
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 SEO spam operation. The primary URL, 'https://mezovuduw.ru/strik?utm_term=cual+es+la+mejor+marca+de+maquina+de+coser', indicates a lure related to sewing machines, likely to drive traffic to malicious or spam sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=cual+es+la+mejor+marca+de+maquina+de+coser PDF link annotation
    • https://reniwojirobegiv.weebly.com/uploads/1/3/5/3/135305036/xuzipubalekisot.pdfIn PDF document text
    • https://beponelife.weebly.com/uploads/1/3/1/1/131164358/341d18e6cdb0c6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_60385b625e501.pdfIn PDF document text
    • https://wabumixa.weebly.com/uploads/1/3/4/5/134585451/5089321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_6018a5783a5e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447647/normal_60533f4ed73b7.pdfIn PDF document text
    • https://gadikidaju.weebly.com/uploads/1/3/1/3/131379663/9434813.pdfIn PDF document text
    • https://dukilukisa.weebly.com/uploads/1/3/1/0/131070258/rilafoj-kurobim-wejiror.pdfIn PDF document text
    • https://kigeneforiw.weebly.com/uploads/1/3/4/6/134648675/3676051.pdfIn PDF document text
    • https://gixoloxivut.weebly.com/uploads/1/3/4/0/134040336/tugusijegaguga.pdfIn PDF document text
    • https://supuzuvafexag.weebly.com/uploads/1/3/5/3/135383103/tonijizogugafetogare.pdfIn PDF document text
    • https://giledaxije.weebly.com/uploads/1/3/4/3/134312043/vofonuxibazilevuzeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454172/normal_602ce79d470e6.pdfIn PDF document text
    • https://fazapezipomen.weebly.com/uploads/1/3/1/4/131453522/3b6784.pdfIn PDF document text
    • https://kaxokotul.weebly.com/uploads/1/3/4/3/134380066/4005247.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/93cde200-eb6a-43f0-86ec-6e9280063b5d/english_grammar_test_advanced_level_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54fa3491-9a99-4a85-846a-0bfc48355345/weathermaker_9200_not_heating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dac37017-fc19-439e-94cc-297ade3ebab1/kupetagibunifamigakole.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_off00011f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F04 5192 bytes
SHA-256: 4db2fea6931103056efc2a1b874659324e4bb166ea61409745f76aa5b759d916
font_01_sfnt_off0001308f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308F 12100 bytes
SHA-256: f862940feb7d2813e12f3499619aac8df4e02ab09f88f2084fdda7068006320a
font_02_sfnt_off0001580f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1580F 16312 bytes
SHA-256: 028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b