Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b9e18efb25e7a7…

MALICIOUS

PDF

78.9 KB Created: 2021-04-15 15:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7254708e660b01204af735935634c08a SHA-1: 22a0da30c3c1dc74b4e1f66979f6e0f66e4cee58 SHA-256: e8b9e18efb25e7a725f2e8348b1a59ee42bb9f75869910665429bc04f45b3e4e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many of which point to disposable hosting and are likely part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a specific TV show episode, suggesting a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=a+series+of+unfortunate+events+season+3+episode+1+full+episode PDF link annotation
    • http://mirror-x.org/effects_of_stress_on_academic_performance70t4q.pdfIn PDF document text
    • http://ecoservice-vlad.ru/netgear_wnr2020_speed4ds9a.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzosiboweja/ZJJjfgd/zuruzumugowetudafotobes.pdfIn PDF document text
    • https://cdn.sqhk.co/novimabe/ieS8iaE/61814267370.pdfIn PDF document text
    • http://reactivascotia2020.com/tifixh1a4d.pdfIn PDF document text
    • http://nadahul.ru/judith_butler_best_booksmg1uy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d9f32f1-468a-4e6e-8fd0-236262902e57.filesusr.com/ugd/28860c_85da3d77d8f142b1a87205355cb35b49.pdf?index=trueIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_959fe76ac20342c6a112105813bcb54e.pdf?index=trueIn PDF document text
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_2e84bba216c148b89bb845e91901f678.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/award_certificate_template_without_border.pdfIn PDF document text
    • http://vosakazabed.rf.gd/hernia_hiatal_tratamiento.pdfIn PDF document text
    • http://pavefobigemaxe.rf.gd/6989609039.pdfIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_22185606c7b44c14aa9be49c440338e8.pdf?index=trueIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_b6eb0c5dcb9c468482785f8ad3b11ab7.pdf?index=trueIn PDF document text
    • https://bc5ba30c-e427-49eb-abc4-9677f18f04c1.filesusr.com/ugd/bcd086_abb6d7721ef642a9a855d84f267d5435.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/belle_de_jour_movie_480p.pdfIn PDF document text
    • https://9e084d23-5bbf-42ad-98e9-fa9200f8584e.filesusr.com/ugd/4f663b_3d2fa6be8c254e8dbc2183a5c0e94acb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/branding_guidelines_typography.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/wivapafeborivegupeku.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/tugetenetus.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_off0000f4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 5300 bytes
SHA-256: 9875f9d65c1b0e8d528a09c2d27a21bf9fb20aaaacfce6e4301259d500e7dee5
font_01_sfnt_off000106f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 11388 bytes
SHA-256: ca797f6408e57dc3c495146a3b0ba08b6390feb0e2a70d58821a1a7e58b4b68d