Malicious PDF — malware analysis report

Static analysis result for SHA-256 da407d94e1a54953…

MALICIOUS

PDF

74.7 KB Created: 2021-03-16 23:40:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 631b9d2de4ef36dfd686d5abaf567c88 SHA-1: 61a1c090308da7f29b8527319beca8ef6d682597 SHA-256: da407d94e1a54953830f196f0e7a0c727c2b27fa50ae2446b16e9151e7d48ef2
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://soxebez.ru/wix?keyword=emily+fischer+caltech PDF link annotation
    • http://bokugoso.22web.org/spectra_s1_review_youtube.pdfIn PDF document text
    • http://kitusozuza.22web.org/archery_hunter_game_apk.pdfIn PDF document text
    • http://wigoduxaru.22web.org/91600817902.pdfIn PDF document text
    • http://nidikasuzarola.iblogger.org/does_my_flip_phone_have_a_sim_card.pdfIn PDF document text
    • http://jelesanu.iblogger.org/19546196398.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_68b2e226d46642dfa1cf9b62fcb4183f.pdf?index=trueIn PDF document text
    • http://begupegag.epizy.com/receptionist_interview_questions_and_answers_for_freshers.pdfIn PDF document text
    • http://xafafomuripag.epizy.com/convert_metric_units_of_capacity_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33edcac4-1356-4804-95ec-9688bc02b80c/can_you_get_ripped_with_bodyweight_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f87a55b7-cdb8-4836-94ea-412772a7f258/is_projectile_protection_good_in_minecraft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a12f8b94-c073-45e0-b681-f68101a910a8/23459805387.pdfIn PDF document text
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_e62fbb3325ec400fb389349bd5c14d0f.pdf?index=trueIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_93018cc37ff2453890258e834a6e310d.pdf?index=trueIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_1378a34b8bd647168fbf81a99e92a56c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be63aca5-0597-4ef4-840d-2648e3501c1a/le_voyageur_contemplant_une_mer_de_nuages_commentaire.pdfIn PDF document text
    • http://nazonuretowu.epizy.com/celebration_of_life_announcement_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16d6d1bc-8f43-485a-a8c3-6c040036a065/mr_robot_series_finale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01d40779-d5ab-4b1c-a61b-1f9a731d26c4/91709831209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c896fd3f-c98d-4173-8f53-288cd3aa6c98/25350200661.pdfIn PDF document text
    • http://tezipibuboxigo.epizy.com/17165041339.pdfIn PDF document text
    • http://bofozimugonofa.rf.gd/pitabibino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93cc22de-e55d-4044-abf4-f6dd51809af1/canon_mp250_driver_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/632e9504-0f19-4f73-b47a-4c1ab929e459/why_is_toshiba_failing.pdfIn PDF document text
    • https://fb3efafe-1b0e-41a1-9434-8bf556110c4a.filesusr.com/ugd/de5e41_0b540ff96fc44b53b4067a4f63b057d0.pdf?index=trueIn 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_off0000e805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE805 5180 bytes
SHA-256: 2d052b8dfe44bc511aa850451d05c7fc664b5fd9ae7a2680c653af6a492d2673
font_01_sfnt_off0000f988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF988 10692 bytes
SHA-256: 921ab85ae793d454ee4456a3c2d6312287b62ea0ad35c4e097cc94ecd4a12278