Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfca0af41b5aecf…

MALICIOUS

PDF

81.3 KB Created: 2021-03-28 00:04:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 366b14fa5a51338438d1eb726a6bae13 SHA-1: 5a73befda96518a363549860bde26ed970771075 SHA-256: ecfca0af41b5aecf60ab93a7b9ccac5764608a52b64ce32b21c9d4238b5990fb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous external URIs were embedded, with a specific heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of 'utm_term' parameters in some URLs further supports a campaign-oriented lure.

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/123?utm_term=granny+mod+menu+outwitt
    • https://static.s123-cdn-static.com/uploads/4418574/normal_5ff89e4795c18.pdf
    • http://pedrons.space/geometry_geometric_probability_worksheetxss88.pdf
    • http://kapubasezo.iblogger.org/lazanovuzixijitaxavujagi.pdf
    • http://aazzzry.space/lalugimenefofapetamutiuew3.pdf
    • http://koparikamoze.scienceontheweb.net/acalculia_y_discalculia.pdf
    • http://hdsamara.ru/3756250283445y3h.pdf
    • http://kunozoxutokusu.mygamesonline.org/drying_shrinkage_of_concrete.pdf
    • http://jekefidaz.mygamesonline.org/sfg20_standards.pdf
    • https://static.s123-cdn-static.com/uploads/4479916/normal_5fc5a39baf20e.pdf
    • http://indir-kazan.com/gikijusuwubetey84ts.pdf
    • http://fawaxifiwuzodil.scienceontheweb.net/adobe_reader_free_download_for_win_10.pdf
    • http://shoop-fl.ru/pikodubiveketogezetirunaptyc03.pdf
    • http://birebap.scienceontheweb.net/pikugumipusegevikogubok.pdf
    • https://cdn-cms.f-static.net/uploads/4462993/normal_605224d08e832.pdf
    • https://cdn-cms.f-static.net/uploads/4417530/normal_605dbdb519ede.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rizalinupegaroz.epizy.com/artificial_neural_network_using_python.pdf
    • http://zixadadafupeg.epizy.com/women_s_cheerleading_uniforms.pdf
    • https://s3.amazonaws.com/bokexizometun/anaconda_habitat_information.pdf
    • https://s3.amazonaws.com/nodetuxapabara/mera_wala_dance_video_song_pagalworld.pdf
    • https://s3.amazonaws.com/muwomapotumugi/11935066343.pdf
    • http://rolizixi.rf.gd/libro_cagliostro.pdf
    • http://maxewunuwujep.rf.gd/what_are_dramatic_conventions_in_drama.pdf
    • http://guseboses.atwebpages.com/buxoturifosesukurezusajer.pdf
    • https://s3.amazonaws.com/rokuwapesu/fijilavibetamaxoxuk.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100a1.bin
4895ae8fee539aff60f3b88c0ff953186e06c4b77bfcfaf993253b8345ff5edd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 4988 bytes
font_01_sfnt_off00011197.bin
da7038bcbe5cea3bb6642b8f213c2e20ad9ec9338d2d524f5ea8e3b12e513b49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11197 11248 bytes

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