Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a768ea71f2a743…

MALICIOUS

PDF

70.9 KB Created: 2021-05-30 21:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8d7c5075e5d0a7b9fd368dcbad0cb081 SHA-1: 445cf51dabdb0b8b9742d9b1aa5d7d661ba43b04 SHA-256: 18a768ea71f2a743007e103a70d2038449201271da8bc86306245a5e7af75f0e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs and the heuristic firings indicate a pattern of redirecting users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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=comprension+lectora+tercer+grado+primaria+pdf PDF link annotation
    • https://mosagalalevo.weebly.com/uploads/1/3/4/6/134668437/1958309.pdfIn PDF document text
    • https://kimonasisu.weebly.com/uploads/1/3/5/4/135400987/xipipe-wobezegag-vapire-xizatafo.pdfIn PDF document text
    • https://giwaxevo.weebly.com/uploads/1/3/4/6/134644090/6506980.pdfIn PDF document text
    • https://wavixozuxukoreg.weebly.com/uploads/1/3/1/3/131380445/592154c8.pdfIn PDF document text
    • https://gebapawuvafiv.weebly.com/uploads/1/3/4/5/134519736/kemevareropejosuxo.pdfIn PDF document text
    • https://manumuxalobo.weebly.com/uploads/1/3/5/3/135387638/1240866.pdfIn PDF document text
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/xobevis.pdfIn PDF document text
    • https://linerebe.weebly.com/uploads/1/3/0/8/130813546/lorabozij-gezozibexoko-kemamorumudol.pdfIn PDF document text
    • https://pupisisewovafon.weebly.com/uploads/1/3/4/5/134500239/fupokuroruvogu_bulof.pdfIn PDF document text
    • https://xegilebul.weebly.com/uploads/1/3/4/3/134347284/f84dbdc23db1b4.pdfIn PDF document text
    • https://tomojuvugitem.weebly.com/uploads/1/3/4/4/134475437/5578247.pdfIn PDF document text
    • https://rowimibakerideb.weebly.com/uploads/1/3/4/4/134494798/nowidila.pdfIn PDF document text
    • https://kagodititaf.weebly.com/uploads/1/3/4/8/134868324/409d031c145.pdfIn PDF document text
    • https://xikubafol.weebly.com/uploads/1/3/4/6/134607040/cc96aad6a86efc.pdfIn PDF document text
    • https://jejaparax.weebly.com/uploads/1/3/5/3/135332208/7120588.pdfIn PDF document text
    • https://bovabesizepin.weebly.com/uploads/1/3/1/3/131383515/8725097.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_605b875f92166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476146/normal_6019c6acd2b1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454179/normal_5fd3065bda9eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/23f3ff1e-83e7-43c0-b004-86e1b3e1657e/2_look_oll.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68807089-6ee2-4ce7-aecd-db2936895eb2/why_samsung_ice_maker_not_working.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_off0000d55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55E 5380 bytes
SHA-256: 0173f283a7e36e04fe96ed5a1bf06f16deb49e6a7c737254193642511a47be2b
font_01_sfnt_off0000e78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78F 11328 bytes
SHA-256: 01d867f39189bdcda0dff1ac9cc71a503f8c1f87109b075d9cb78e0598425fa5

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