Malicious PDF — malware analysis report

Static analysis result for SHA-256 20fbfd68664b0dbe…

MALICIOUS

PDF

77.5 KB Created: 2021-02-28 14:28:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4bf5f14f9eb2bc7581f36be87a3bd561 SHA-1: eac4f4f61950a9e7ac29cb334f5c92d3e9c3110d SHA-256: 20fbfd68664b0dbec700966240adb444c04edf7d31580f96dd64de832d3fc76e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure. The ML classifier also flagged the document with high confidence. The document's structure and embedded links suggest a phishing or redirection attempt to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+to+the+slave+is+the+4th+of+july+text In PDF document text
    • http://pozorigedaxepi.iblogger.org/best_tower_fan_with_ionizer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494888/normal_601b901adb317.pdfIn PDF document text
    • https://cdn.sqhk.co/keliziniw/57PSjhi/guided_meditation_script_for_kids.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413374/normal_601e8532601e1.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/how_to_reset_uconnect_ram_1500.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388407/normal_5fddc0e5251b3.pdfIn PDF document text
    • https://cdn.sqhk.co/ridijafugemi/j4jbjfm/dofadafusefifemedemiw.pdfIn PDF document text
    • http://daddytestit.xyz/born_in_blood_and_fire_4th_edition_chapter_2_summaryvr0wg.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/dR6jahh/eric_church_songs_popular.pdfIn PDF document text
    • https://cdn.sqhk.co/ligilitojob/jfY9gdZ/guxovakifeniguxipid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444100/normal_6018def0a7c09.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/american_megatrends_keyboard_detected_but_not_working.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://disoluje.myartsonline.com/bojotasatefimoxiloruf.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/suveritibefajebonuv.pdfIn PDF document text
    • http://gazonenewotife.epizy.com/automatic_capsule_filling_machine_manual.pdfIn PDF document text
    • http://widusop.atwebpages.com/28809650510.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/aramide_ft_adekunle_gold.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_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 5168 bytes
SHA-256: f5ebcc1c6179bd042fa3c088ce1ca34af53bda645d0417991a5e7851b52eeac7
font_01_sfnt_off00010412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10412 10812 bytes
SHA-256: f7418b033f254a14c49089b4a2f38049c23ff9d592985219e926e3b6c6046615

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