Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a608b71c5455a04…

MALICIOUS

PDF

95.3 KB Created: 2021-03-14 08:22:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fd87ecf9eaf865ba8ed5660747dfd9af SHA-1: 576cbeb78f25c36f8a44aa4536e282d7ef2b97af SHA-256: 1a608b71c5455a04da62b40dcc09496e4ac932cc9d16edd8f3fa794a8a572a08
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with several pointing to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=assistir+globo+reporter+online+de+hoje PDF link annotation
    • http://constructionhouse.info/ccleaner_professional_ly._irpced4.pdfIn PDF document text
    • http://pribor-poverka.site/crossroads_pizza_fitzwilliamnzgx1.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/XUwYijt/70790764271.pdfIn PDF document text
    • http://pedron.fun/dezixakidobuzozuluza9eh6q.pdfIn PDF document text
    • http://xabigaxen.22web.org/44722955655.pdfIn PDF document text
    • https://cdn.sqhk.co/gozajare/hgbHjcD/freebies_live_daily_freebies_deals_coupons.pdfIn PDF document text
    • http://mejijajel.iblogger.org/87066338470.pdfIn PDF document text
    • https://sivaxawisebirim.weebly.com/uploads/1/3/1/4/131407763/5156901.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/jbhejbX/top_worship_songs_2020_youtube.pdfIn PDF document text
    • https://nuzaguwimera.weebly.com/uploads/1/3/4/4/134492670/3475356.pdfIn PDF document text
    • https://kikosezuzo.weebly.com/uploads/1/3/1/3/131378972/1396053.pdfIn PDF document text
    • https://nofizosol.weebly.com/uploads/1/3/4/5/134500220/xudotuvufukuwi-gitopaj-kewapikazawam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lesodabat.epizy.com/how_many_calories_in_1_blueberry_muffin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/599013b2-7888-4178-8428-2b6fc0c676c9/17492642418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07663b99-a16f-4e18-810f-01cbcaad1f5c/propel_helicopter_wont_charge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a8c7fa6-5344-498b-89cd-3dcef15706b1/how_to_replace_a_valley_shower_faucet_cartridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82d17ae6-0d20-4910-82ab-5ea25edba9fc/59810597626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82250ae0-7d30-4ab9-8192-ccd83b74ff06/manual_de_supervivencia_urbana_fernando_aguirre_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64c14b2b-bddf-4a8a-b524-8a06e6325de2/gufejer.pdfIn PDF document text
    • http://runonadopufeta.epizy.com/87675533872.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/739ee627-9376-4933-b8de-6f7766d98120/does_naofumi_marry_raphtalia.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87F 8776 bytes
SHA-256: 7c37ae840ad553d1f34e7a603457beff1968e5685d228f4635dd76eb0adfd644
font_01_sfnt_off00010fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD7 4228 bytes
SHA-256: 37ed11130cc84a57e1273b0729396131d69ce462fb008baac3c77aadda8e4caf
font_02_sfnt_off00011eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEC 5216 bytes
SHA-256: cb133649f4594626e2ccdfcac9d9bdc1941c3764e4d1e0831d1691fb84026f9f
font_03_sfnt_off000130a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A1 11824 bytes
SHA-256: c4c5b08f5bc075f6a5009c36e3ef6ca1faf7700e57bc478a53e57f1028dbc938
font_04_sfnt_off0001593c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1593C 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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