Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f822e012afd26a4…

MALICIOUS

PDF

88.3 KB Created: 2021-04-25 18:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8aa5c2e401fedcf867bc8375b3019551 SHA-1: 0771de4f64f91d4eb0fd9222da4d57f4ab7410c0 SHA-256: 8f822e012afd26a41991b21c1a56c23e9559f9ad1bbd295fcddb9fbbac614bc1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/strik?utm_term=echo+srm+210+weed+eater+head PDF link annotation
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/pawusagal-pofev-tumegik-gumin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409826/normal_6021f66308810.pdfIn PDF document text
    • https://foxenaduro.weebly.com/uploads/1/3/1/1/131164157/0f8b91b43ec4c3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498834/normal_6035a32ce9b9a.pdfIn PDF document text
    • http://wojidibotetim.22web.org/book_report_template.pdfIn PDF document text
    • http://nivakagudan.22web.org/beautiful_background_for_photos_free.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/xojikogetusu-pomipi-rezogibupefe-zakotivifibijo.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/731441419806e5cj.pdfIn PDF document text
    • https://nixujukasal.weebly.com/uploads/1/3/1/6/131636737/16d1f.pdfIn PDF document text
    • http://esclub.pro/17857599401u38ro.pdfIn PDF document text
    • http://ru-order-687646765445.art/gugopidurelomeganuloo6ub7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426071/normal_5fefbd55cd359.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/when_should_you_change_transmission_fluid_on_2018_honda_accord0vdj0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408873/normal_5fe2a40d536be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_2af5cdb62b4f48c3a6e6c6cbb68cbe56.pdf?index=trueIn PDF document text
    • http://gizivafufet.rf.gd/aarya_telugu_movie_songs_naa_songs.pdfIn PDF document text
    • https://115777a2-cc0e-4789-9e99-30cf4bdfca1a.filesusr.com/ugd/2b3546_90655ada0f694f8aa16cf5d847ed2224.pdf?index=trueIn PDF document text
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_b9c1eb3533bc47c0b063e6ea3714274f.pdf?index=trueIn PDF document text
    • http://setevibebevu.epizy.com/how_do_you_build_a_septic_field.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f63fac65-eccf-4275-a82b-9d324da62a9a/letra_de_haz_llover_abre_las_puertas_del_cielo_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d503a68-fbfd-4092-9610-dc5c1461ecc6/ipad_mini_2nd_generation_keyboard_case.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a79db525-2bd8-4d2f-a4e3-7a636694f862/how_to_program_garage_keypad_clicker.pdfIn PDF document text
    • https://f27bca7f-571c-471d-9e77-92385e6dfcd0.filesusr.com/ugd/9a0fa1_c38463612bc7426f8695e293f915b9dd.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_off0001176c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176C 5520 bytes
SHA-256: 72a438811587ea1b79b415100c3d7ff5999c9885ee980205c06edaa6fd8d5a2c
font_01_sfnt_off00012a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1A 12104 bytes
SHA-256: bb8477d8a80a5300a9281e74d2ce8b93e05227bd37030a86e664f90d1b2cba4b