Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f75b460f827c138…

MALICIOUS

PDF

94.9 KB Created: 2021-03-16 03:14:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8b6144a56ad79414c02471b641f9693d SHA-1: 593a51cca67c125fadfde2e46c9df5df62bd9156 SHA-256: 3f75b460f827c13853cd32198db8422e09e2d7383937099e08b3209890d207c7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://maypoin.ru/strik?utm_term=dc+adventures+heroes+handbook PDF link annotation
    • http://teenagetutor.net/will_there_be_a_9th_outlander_bookr0qqc.pdfIn PDF document text
    • http://poremidozarulu.iblogger.org/is_anything_at_taco_bell_healthy.pdfIn PDF document text
    • http://healsmall.space/98403788031633t8.pdfIn PDF document text
    • http://wukimokoled.iblogger.org/reportable_irregularity_auditing_profession_act.pdfIn PDF document text
    • http://xodinazafomizi.22web.org/does_kicker_count_on_two_pair.pdfIn PDF document text
    • http://snatural.space/275880404111surx.pdfIn PDF document text
    • http://tuxoseve.22web.org/pijon.pdfIn PDF document text
    • http://kadabafomelu.66ghz.com/index_of_computer_engineering_books.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_53c553b8d2d44b1f9c523756111813be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b0a24d-a7ea-4a2b-86aa-9e3314ff9814/can_i_delete_ntuser.dat.log1.pdfIn PDF document text
    • http://wigugagekubog.rf.gd/twenty_one_pilots_stressed_out_lyrics_spanish.pdfIn PDF document text
    • http://feliruxitekul.epizy.com/zovewufa.pdfIn PDF document text
    • http://pavipalu.epizy.com/glidden_paint_reviews_consumer_reports.pdfIn PDF document text
    • http://mubomapobe.epizy.com/2008_avenger_starter_relay_location.pdfIn PDF document text
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_0efbeb5c0c124af086805072aa91ba8a.pdf?index=trueIn PDF document text
    • http://vibosaxijus.rf.gd/vujenekezagirituwabijipes.pdfIn PDF document text
    • http://rawatakutuju.rf.gd/97255553807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e85f589f-28cd-4301-966b-636ecf2ab6d9/easy_classical_guitar_songs_tab.pdfIn PDF document text
    • http://luvoxijamubisur.rf.gd/volume_of_different_shapes.pdfIn PDF document text
    • http://gewopebij.epizy.com/how_do_i_pair_logitech_h600.pdfIn PDF document text
    • http://fukatotapi.epizy.com/79568439143.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_off00013470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13470 5256 bytes
SHA-256: 7f61fb4571ff807654c51feddd6ca85d85c9bd9455a59e96814574ed1867855b
font_01_sfnt_off00014653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14653 11924 bytes
SHA-256: 09811db0a3a3e7deb2a6f662300bfbf78c8cbdeb56cd7f25461f9a8040c7ca29

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