Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c4e007cc03ada4…

MALICIOUS

PDF

71.5 KB Created: 2021-03-17 04:25:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ddb16fe64e2fd4161c15b926e530e2c6 SHA-1: bed79f53ccaba90aa84688286e5a72e4d4e62a9a SHA-256: 67c4e007cc03ada47bdf8bf03770f20000231e173edf7172e257c53c09b8888f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains and are likely part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious sites, potentially for credential harvesting or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/123?utm_term=kenilworth+nursery+school+ofsted+report PDF link annotation
    • http://hookup668.site/what_jobs_can_i_get_with_a_data_science_degreeerqju.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/balaxazelojudidexo.pdfIn PDF document text
    • http://gogogoinst.xyz/hp_c7280_printer_repair_manualxb37v.pdfIn PDF document text
    • http://byseles.xyz/nemeperegizorebaxason9b1t.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/90203593021.pdfIn PDF document text
    • http://favodokoleti.mypressonline.com/1833039887.pdfIn PDF document text
    • http://www.kenilworthns.org.uk/wp-content/uploads/2020/07/KNStour.m4vIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xogowakowokavuw.rf.gd/free_english_worksheets_for_kindergarten.pdfIn PDF document text
    • https://3c45aaf8-24f3-4cde-9773-cf44a0a970d3.filesusr.com/ugd/ae7d54_2e8b7fff08264f9ab9cf94c55be984db.pdf?index=trueIn PDF document text
    • http://reronagut.epizy.com/kijerokabep.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/wititopowuwusujugusonot.pdfIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_1e03bd68bf584cffb56de6d6dd443899.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/business_lease_agreement_contract_template.pdfIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_ec6f4a5c50bd491b81bd6a32ccb4f9aa.pdf?index=trueIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_11f9f2b16ec745819422f3e6f80726ef.pdf?index=trueIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_2ca11358cd1c41769e958880946ecdc0.pdf?index=trueIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_1812cce1060641bf88d68b52339ec812.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/new_google_play_store.pdfIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_5d946beb204b4c8d97528fac9f2a95df.pdf?index=trueIn PDF document text
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_7ee312f51f4d47229b26cce0b0df63b3.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_off0000da24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA24 5196 bytes
SHA-256: 822598830b25d863749fe22aee7949d438b3dfccc0a219e4821006385ffc1330
font_01_sfnt_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 10636 bytes
SHA-256: c9c650886efe4d15642226f4ed29f1706cd383598486ed349c611a99d8fe9bfb