Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e30b8d36cad62e…

MALICIOUS

PDF

75.0 KB Created: 2021-03-17 11:23:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c8732fd92f428cbba6e7e50065864775 SHA-1: 1235ac18836e08ac14b831af4e6eb54b28f73dfe SHA-256: 42e30b8d36cad62ee9ddf40aeb3a97b3e48542839e5d6f250c5f7ad396b03828
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=laboratory+manual+for+principles+of+general+chemistry+10th+edition PDF link annotation
    • https://cdn.sqhk.co/wepunajexiju/zFjgihD/residence_inn_atlanta_mcdonough.pdfIn PDF document text
    • https://cdn.sqhk.co/kazamepa/NieCggm/did_it_freeze_last_night_in_saskatoon.pdfIn PDF document text
    • https://cdn.sqhk.co/zedazisem/jfiiIqA/cartoon_paper_and_pen_clipart.pdfIn PDF document text
    • http://tuwasukam.getenjoyment.net/will_us_society_collapse.pdfIn PDF document text
    • http://zubiki.top/9562834464877tty.pdfIn PDF document text
    • http://gosepakaf.getenjoyment.net/inspirational_bible_verses_for_youth.pdfIn PDF document text
    • http://kanshoper.site/how_to_fix_bose_remote_controlz0a01.pdfIn PDF document text
    • http://fbcopyright-center.com/uni-com_doorbell_change_tone5yxrj.pdfIn PDF document text
    • https://cdn.sqhk.co/kixituvelil/ce4thae/sound_of_the_sea_movie_online_full.pdfIn PDF document text
    • http://teksol.xyz/pilumijususebunowilndx4o.pdfIn PDF document text
    • http://visetazide.medianewsonline.com/63343633469.pdfIn PDF document text
    • https://cdn.sqhk.co/riketumes/iEiqhht/60724952788.pdfIn PDF document text
    • http://idealslimitaly-official.site/graphic_organizer_for_writing_an_informative_essay4ebnt.pdfIn PDF document text
    • http://awpmode.com/228638406981s1w1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuzebelinebofe.epizy.com/58035894826.pdfIn PDF document text
    • http://kizuxaw.rf.gd/39973447980.pdfIn PDF document text
    • http://talodidijuxeni.rf.gd/gexibefizuvamenemizel.pdfIn PDF document text
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_7dd745a6a47b4c7c9614e07c70f7590e.pdf?index=trueIn PDF document text
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_b595d3ac08c0484c9661a35b013a71d4.pdf?index=trueIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_68fc3ad08ff342d39f630bf3e4f9345e.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_off0000dec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC7 5944 bytes
SHA-256: de4388b279d8d1d08d2bfcaf27421104780dce5aab5c0ab4cb0eda2e8e900633
font_01_sfnt_off0000f2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 12968 bytes
SHA-256: 75065971c3d6e6486683506328ea38a97aabd4dfd0769f124b7d5e6211bad284

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