Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab86e3f7ff54cf8…

MALICIOUS

PDF

70.4 KB Created: 2021-04-18 19:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fa19acdc09a428a1fbb7f9320ca44617 SHA-1: 5a2ee8f92c941aac123eef49384c49961e51e7e8 SHA-256: dab86e3f7ff54cf804ef6632053deb2c53633be8378230903df7e1b2a6f8e554
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to obscure the ultimate destination. The primary lure appears to be 'Office 365 free training videos', which redirects to these link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=office+365+free+training+videos PDF link annotation
    • http://bimoxalobabi.iblogger.org/recorder_karate_black_belt_songs.pdfIn PDF document text
    • https://falojixij.weebly.com/uploads/1/3/4/8/134878909/suxitemo-gisadepefatuf-jonegivinexuxar-biwegemipeg.pdfIn PDF document text
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/fbf9e8.pdfIn PDF document text
    • https://pinowutofabu.weebly.com/uploads/1/3/4/7/134763632/9396384.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401692/normal_606acae594d09.pdfIn PDF document text
    • http://paxezimusosesa.scienceontheweb.net/25112623537.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487208/normal_6008ceeb33ba1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412899/normal_6055613d57dac.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/42903272034.pdfIn PDF document text
    • http://semasinizitowo.medianewsonline.com/jaquar_sanitary_fittings_catalogue.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418385/normal_602606881f161.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e222b685-7c7f-4cee-b050-218328c89257.filesusr.com/ugd/c0232f_e4c53281fc604712b4766d9addb54950.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8799eb9a-4776-4965-9f65-137dfe29798c/97423357948.pdfIn PDF document text
    • https://1e35b969-1f99-48dc-8aa8-d0fb9638bdc8.filesusr.com/ugd/970baa_551229d70b8145548e5eb8873a4bde23.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e63334c-0c24-4c16-b12d-cb0ef0ac7d6c/kukuxovajupujum.pdfIn PDF document text
    • http://bozusofofutuv.rf.gd/alpine_ktp-445u_bridged_wiring.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bee15f82-d04e-444c-8ae1-90babd441160/progressive_tense_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7dcca36-7327-4289-89fa-f60d906f69e0/77694166324.pdfIn PDF document text
    • http://bugenuvumap.atwebpages.com/wisdom_books_of_the_bible.pdfIn PDF document text
    • https://8ab8d0a6-ebcf-4503-ac90-3c5d9a0926ce.filesusr.com/ugd/8585d4_0df92ae46c584b77acb0d7f0dc554d1c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29eb4262-56d5-454a-9583-962c4f3fed77/core_java_interview_questions_and_answers_for_experienced_javatpoint.pdfIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_faab5cf39e7740f9befdaf09e21b4e97.pdf?index=trueIn PDF document text
    • http://pijosufun.myartsonline.com/34915949301.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_off0000d631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD631 5684 bytes
SHA-256: 161df2b51b34987391deaf515496ba86eedd68d7e9f24469c7d4a4dc587d3edd
font_01_sfnt_off0000e9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 10196 bytes
SHA-256: 7361d790e4216a2794ce5bcee3bdea92844f3bba88f18465b077debacd743785