Malicious PDF — malware analysis report

Static analysis result for SHA-256 631a4388659a0ab1…

MALICIOUS

PDF

77.2 KB Created: 2021-03-25 03:32:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f9f1c1404cdb8903543dab4a3a55ff5d SHA-1: 780679303400f7fe0b37ef2181f7c825575d01ff SHA-256: 631a4388659a0ab1e573e27ae852748a4f9139a58355f788978a630b0eda5d07
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to product searches, suggesting a lure to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://ponafet.ru/strik?utm_term=troy+bilt+weed+eater+pole+saw+attachment PDF link annotation
    • http://vapusokupasaz.iblogger.org/mugokipopi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_603e42ba9a4a2.pdfIn PDF document text
    • http://salet.store/discharge_letter_templategrak8.pdfIn PDF document text
    • http://evilcheats.fun/29779851773ywgwx.pdfIn PDF document text
    • http://rasazajafatirek.mypressonline.com/canvas_todataurl.pdfIn PDF document text
    • http://b4shop.icu/37429544637iai7.pdfIn PDF document text
    • http://favodokoleti.mypressonline.com/2_g_ml_to_lb_l.pdfIn PDF document text
    • http://mavito.online/the_daily_stoic_ryan_holiday_review07hl9.pdfIn PDF document text
    • http://misifebofol.mywebcommunity.org/defectos_del_tubo_neural_2020.pdfIn PDF document text
    • http://bikumusuzavug.22web.org/mimaguxezinibileti.pdfIn PDF document text
    • http://bagomebefekixob.getenjoyment.net/best_network_study_guide_reddit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456989/normal_5fe84f9cd1f25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458124/normal_600f65075517a.pdfIn PDF document text
    • http://fedexonep.mypressonline.com/jumusegorurejoluwusofis.pdfIn PDF document text
    • http://gonifarej.mywebcommunity.org/how_long_did_the_depression_last_in_australia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/03d9593a-b596-40d5-b927-6ef3f9afe9f2/98937863432.pdfIn PDF document text
    • http://lugenizuridaj.atwebpages.com/14011579019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3f6f39e-6b93-48db-80ae-a346d9dd0d44/how_to_clear_trouble_light_on_dsc_power_832.pdfIn PDF document text
    • http://zogoxuf.atwebpages.com/livefejuleduvumetu.pdfIn PDF document text
    • http://jimarol.myartsonline.com/tumupizasoludanajevut.pdfIn PDF document text
    • http://woxomog.rf.gd/cape_wide_news_court_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/374a7c9a-d210-4fcc-b3cf-14ab01ca29c6/does_table_salt_have_healing_properties.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eae9ee1f-aa05-4db3-bc37-c9ea4909682f/21955049130.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE174 5384 bytes
SHA-256: a4c20fef232a8bafb2828053ac867165aa76e1ca88480030986f7d84455afedb
font_01_sfnt_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 10484 bytes
SHA-256: 3a65e66e5b481223ec6f053197c7b00d778bb3472a0219294f8c98ee73024248
font_02_sfnt_off00011769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11769 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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