Malicious PDF — malware analysis report

Static analysis result for SHA-256 522b25b5168c2d6d…

MALICIOUS

PDF

87.1 KB Created: 2021-03-11 01:08:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 052ad7163e72f8b656bbd5a4b6d4f4a6 SHA-1: 4c3631d90cf8f8833a4304794a93c42ac0b762c9 SHA-256: 522b25b5168c2d6d23f980f148c3506b94c29934f61e31023900dbb25d1ad252
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users to potentially harmful sites.

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://nipisod.ru/wb?keyword=harry%20potter%20and%20the%20philosopher PDF link annotation
    • https://cdn.sqhk.co/nukunudakiju/X2e8jgd/rotator_cuff_tear_recovery_time_after_surgery.pdfIn PDF document text
    • https://viwefinorix.weebly.com/uploads/1/3/0/8/130813514/giwixolixu-pijezisiv-borez-jivelu.pdfIn PDF document text
    • https://cdn.sqhk.co/sowumavag/c8DkhgI/26890615662.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/jtheEWa/lightroom_online_free_trial.pdfIn PDF document text
    • http://3gusevshop.space/bpsc_mains_question_paper_political_scienceqpy5r.pdfIn PDF document text
    • http://medtechnika1.ru/one_touch_drawing_apk_free_download0ng9e.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/fgiViaU/tidizuv.pdfIn PDF document text
    • https://kixorixoti.weebly.com/uploads/1/3/0/7/130740187/49fe30.pdfIn PDF document text
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/simukalew_kufivogajim_wawetoputigo.pdfIn PDF document text
    • http://e-devletodeme.net/resonant_weapon_vs_dark_weapontb5rn.pdfIn PDF document text
    • http://buyfastedcircle.xyz/99197255508pte6l.pdfIn PDF document text
    • https://cdn.sqhk.co/demanajinu/jZhghcl/58489677660.pdfIn PDF document text
    • https://tusopapa.weebly.com/uploads/1/3/2/7/132712380/fepoja.pdfIn PDF document text
    • https://cdn.sqhk.co/vijukifezu/heNijhj/private_wifi_address_on_router.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/1bhbgfb/dungeon_village_2._1._9_apk.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://s3.amazonaws.com/limepusotanal/form_action_in_submit_button.pdfIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_315af3af61ee4f5a9110891a81727af5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/best_chrome_extension_manager.pdfIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_03a7a2a5f35e48b7876b4b514635ca54.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/telugu_agnathavasi_background_music.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/el_principito_y_la_rosa.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/fejabilegesif.pdfIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_9488ee7ccd2c415fbb792ca829556eac.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10827 5504 bytes
SHA-256: 8c5d3c4267cd838f314d7d1e01fa2b3a61db15ab8e87a43956dd50260b38eb52
font_01_sfnt_off00011adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADF 10972 bytes
SHA-256: bc35a49a580e5aff42f9c69dd0e3088dfcf364ecaecd8cdf12303e55fb8043ce
font_02_sfnt_off00014028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14028 4324 bytes
SHA-256: 781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60