Malicious PDF — malware analysis report

Static analysis result for SHA-256 e10515956cbc8d72…

MALICIOUS

PDF

72.1 KB Created: 2021-03-23 18:24:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 474faf8f8f643255696697695a77bdd4 SHA-1: 0903a32cc07f712fcddba45e3de91926e18a6cc6 SHA-256: e10515956cbc8d721124d254d3d85d91c0cdc9664e886a92582b3f88c1268e9c
134 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs, with a notable link farm heuristic suggesting a phishing or spamming intent. While the document body is heavily obfuscated, the presence of external links and the 'urgency lure' heuristic suggest a phishing attempt, likely leading to a malicious payload download or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nipisod.ru/wix?keyword=madden+mobile+schedule PDF link annotation
    • http://xedekozis.22web.org/university_calculus_early_transcendentals_2nd_edition.pdfIn PDF document text
    • http://tonalemeketav.66ghz.com/50298009427.pdfIn PDF document text
    • http://sopesukenapad.scienceontheweb.net/gudazeweximugogarobujenib.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/arunima_sinha_book.pdfIn PDF document text
    • http://zakapanu.iblogger.org/how_to_mount_a_samsung_55_inch_uhd_tv.pdfIn PDF document text
    • http://gemosugobez.22web.org/the_condition_of_the_working_class_in_england_summary.pdfIn PDF document text
    • http://wokokijup.iblogger.org/akc_puppy_litter_registration_form.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_ed547a6396474aa580f985612fc190ec.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_c218f5e0ef1a4659b4b469f08b1d769d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ee5c64e-e35e-4a5c-9e2c-b6a040e63872/88679831574.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/safety_first_ear_thermometer_directions.pdfIn PDF document text
    • http://sofidusujewa.epizy.com/how_to_turn_on_pilot_light_worcester_boiler.pdfIn PDF document text
    • https://351e5f87-f9e5-4015-92cd-d601692b9ec3.filesusr.com/ugd/a0d0d3_ad87a5794abc423292b7b65a8fa418f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/how_do_i_find_my_remote_access_code.pdfIn PDF document text
    • http://fudixuxutinizow.rf.gd/adhesive_foam_sheets_wholesale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b420c39d-c1e1-48da-a78a-9620635fc559/easiest_way_to_learn_thai_alphabet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f68e9b0e-c031-43dd-a17f-4a5bd69745b4/niniv.pdfIn PDF document text
    • http://wuxigukupem.epizy.com/91015848073.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/how_to_convert_graco_lauren_4-in-1_convertible_crib_into_toddler_bed.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/2482462602.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_off0000de07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 5228 bytes
SHA-256: 11bfeb6798016fa111974128f704bdbc509804adf0a819304189dc106ac51a87
font_01_sfnt_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 10444 bytes
SHA-256: 70bb2c759b7ff7fe23c88259f21cbec8d59d274badb569180607c77a7b885866

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