Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b6695b4d57414c…

MALICIOUS

PDF

73.8 KB Created: 2021-04-06 20:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f0be12c50119891c3a0e3fd0c269c5af SHA-1: a91b2b75c3ea886c6b6fe326ef5c5733468d6743 SHA-256: 70b6695b4d57414cdd629967fb2ad0f057ba16e64ac838103656d20ea29524aa
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one, 'https://bologen.ru/award?keyword=agricultural+science+textbook+pdf+grade+12', appearing to be a lure disguised as a textbook download. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links, likely for SEO manipulation or to distribute various malicious payloads. No scripts were extracted, but the presence of numerous external URIs points towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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 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://bologen.ru/award?keyword=agricultural+science+textbook+pdf+grade+12 PDF link annotation
    • http://muzibatixabu.mypressonline.com/pencil_shading_worksheets.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/togesarotasakakqqsy.pdfIn PDF document text
    • https://nitipitu.weebly.com/uploads/1/3/0/7/130775162/nozejoden.pdfIn PDF document text
    • https://zeberafuduzugag.weebly.com/uploads/1/3/2/6/132682167/1834101.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/kigabakozemateribix.pdfIn PDF document text
    • https://vurinilobato.weebly.com/uploads/1/3/1/4/131454355/vusamiriked.pdfIn PDF document text
    • http://gamedv.design/how_many_calories_are_in_a_wendys_double_cheeseburgerdcnip.pdfIn PDF document text
    • https://besajiti.weebly.com/uploads/1/3/1/8/131856076/7832038.pdfIn PDF document text
    • https://lorotorerusut.weebly.com/uploads/1/3/1/4/131452969/b4aff99.pdfIn PDF document text
    • https://wajegeteb.weebly.com/uploads/1/3/4/8/134896445/lanimovulizosozof.pdfIn PDF document text
    • http://digtalcaliper09.xyz/how_to_use_daikin_split_system_remotefzk7i.pdfIn PDF document text
    • http://politach.com/ryobi_3100_psi_electric_start_pressure_washerf0hf0.pdfIn PDF document text
    • http://okrasote.info/bozajosagamotoby05cv.pdfIn PDF document text
    • https://kazazurijufom.weebly.com/uploads/1/3/0/8/130814205/faduf.pdfIn PDF document text
    • http://vulufinagi.mypressonline.com/el_arbol_de_la_vida_kabbalah.pdfIn PDF document text
    • https://rimofemosi.weebly.com/uploads/1/3/4/3/134351632/73375cc0d10f343.pdfIn PDF document text
    • http://waverufusufafuv.scienceontheweb.net/solasi.pdfIn PDF document text
    • https://xufiridib.weebly.com/uploads/1/3/5/3/135346556/rekojeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2e12398-bd88-43de-9efa-f9841e6e7e41/flexible_dieting_lifestyle_recipe_vault.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab04757f-4026-4557-a488-63d80b2ab970/epson_perfection_v370_photo_film_and_slide_scanner_review.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/33153642255.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/71310344285.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/4_circle_venn_diagram_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/atom_launcher_paid_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e41a2a9-6351-471b-acb6-2ca3ce61de29/pevuge.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/39961493138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/341f3823-1da7-435c-9419-01c34b34abaf/2000_ford_ranger_transmission_filter.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_off0000e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 5768 bytes
SHA-256: 31298f3d455e1d55875933b5839d4a1d907891e2db0b0be5c37040d7d6ace6f5
font_01_sfnt_off0000f495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 10760 bytes
SHA-256: 26fee456cf4c4ace1981aaa1209982417b437a8cdf842d95ff3d35b726f82a67