Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd94a7749a816ff…

MALICIOUS

PDF

76.3 KB Created: 2021-03-30 03:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5609e858eb738aa9b7e870869e9e3d41 SHA-1: 4e868638db6b16877991d00533aa5bab24ce907e SHA-256: 8fd94a7749a816ff7f9d4b4223a1abc3a45c1939b8be4f8b8ddf479b41fd2e13
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://dafemum.ru/award?keyword=cabanellas+diccionario+juridico+bilingue+pdf PDF link annotation
    • http://italysummer.fun/what_happened_to_taco_bells_menulkolv.pdfIn PDF document text
    • http://beautysale.site/romeo_and_juliet_summary_act_1_scene_4tui2p.pdfIn PDF document text
    • http://proita.space/design_will_change_the_world3d13e.pdfIn PDF document text
    • http://trells.space/redejonufibawaral2lgk5.pdfIn PDF document text
    • http://fofolep.mywebcommunity.org/what_is_a_major_reason_the_renaissance_began_in_the_italian_city_states.pdfIn PDF document text
    • http://ligugiban.scienceontheweb.net/sosapo.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://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_94e74674855f4b2a8795fb579684a7fc.pdf?index=trueIn PDF document text
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_7bfa060da1bd472c91aa96839e85a709.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/b._a_admission_form_2018_uos.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/girawufowabujaridobamum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2518005a-c600-4ce4-92a8-84a868aaaed0/convert_music_to_midi_online.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/11355618827.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/anualidades_diferidas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bc6d020-05ac-46e6-862f-e7f2fceb555b/autocad_command_window_gone.pdfIn PDF document text
    • https://4da44922-6ee1-4515-aed7-54c3d6b51f77.filesusr.com/ugd/243a28_00eea89605764cccba9cc47fefe67fb4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d742f323-dc10-41c0-814a-661bed64b34a/jowezumidelajaforizisi.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/tizesurugiv.pdfIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_f72b8f3cc8724dc49f031ecb7453cca8.pdf?index=trueIn PDF document text
    • http://xezaretidatoro.onlinewebshop.net/rubagume.pdfIn PDF document text
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_36ae502b61ef405f92d5497bd0131129.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA30 5364 bytes
SHA-256: 24039559828c83fcc0fe306b89ba10730e28b5ca8c8dd6da71950c5ae25f9b3b
font_01_sfnt_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 14320 bytes
SHA-256: 8b3c5a7b3da99b073fa36aba2d3cf4d690660f4704fed16fc0d24ee1dcbe059a
font_02_sfnt_off0001195a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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