Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca41731490d626b9…

MALICIOUS

PDF

74.8 KB Created: 2021-02-22 09:54:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 013ed778e6f50693d14deb10e50a4eda SHA-1: ce641e8af429535cada7f555d4b3095892c8aaff SHA-256: ca41731490d626b97be10cdc2c1806397e7995975950efded354b6a91247cd5a
204 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure, and the presence of multiple links to disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://crophysi.ru/wix?keyword=mattress+firm+warehouse+tucson+az In PDF document text
    • https://cdn-cms.f-static.net/uploads/4447273/normal_601daeb582f5e.pdfIn PDF document text
    • https://cdn.sqhk.co/bujavenizake/tiaPidU/pregnancy_rash_on_belly_not_pupps.pdfIn PDF document text
    • https://cdn.sqhk.co/vuveleni/2XhhCVY/angie_s_list_appliance_repair_arlington.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388183/normal_6026413a6313a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391000/normal_5fecce541a3f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366993/normal_5ffa17b31839f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379230/normal_60189f67e929d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495551/normal_5feb854f1022c.pdfIn PDF document text
    • https://cdn.sqhk.co/wezupobuwab/ijplgiA/61692466374.pdfIn PDF document text
    • https://cdn.sqhk.co/norumuwapa/BKThMgg/how_to_draw_signature_in_word_with_mouse.pdfIn PDF document text
    • http://tawivafewak.22web.org/profiles_in_courage.pdfIn PDF document text
    • http://dofukatejipoz.66ghz.com/android_auto_alternative_xda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://likijanima.epizy.com/59108253161.pdfIn PDF document text
    • http://pidosowot.epizy.com/gipuzum.pdfIn PDF document text
    • http://kezatafoxab.epizy.com/backuptrans_android_line_to_iphone_transfer.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/esp8266_sdk_programming_guide.pdfIn PDF document text
    • http://xonumubik.rf.gd/platelet_transfusion_guidelines_anesthesia.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/community_college_hero_first_hell_test_answers.pdfIn PDF document text
    • http://lizusesujujes.rf.gd/jurnal_titrasi_alkalimetri.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_off0000e71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 5236 bytes
SHA-256: bf64e3182a5ffd5686b64c4e62cb3bc667dbeadd1b4ad210120255cd4f992986
font_01_sfnt_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 10948 bytes
SHA-256: d780c380855e2f0142e8a112d852a23c0478e383aaa4c87f2b82da0f973c6fbd

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