Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc55f644fd8abef…

MALICIOUS

PDF

77.7 KB Created: 2021-03-11 23:27:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e1abfcdd8246a970650a3bfad0dab739 SHA-1: b20d78480093c98e7bc8d85e05f9f283804ffe7b SHA-256: fdc55f644fd8abef3e48afa36adee9acfb443e09a783c06f4e3ef0ba6f77b4ac
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/award?keyword=rsmeans+building+construction+cost+data+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/xorilulog/mIhgijB/real_craft_3d.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/7369509.pdfIn PDF document text
    • https://cdn.sqhk.co/nunexijezep/bjcnghF/29427230968.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/g2fvhg6/59899811620.pdfIn PDF document text
    • https://nanupubixo.weebly.com/uploads/1/3/0/9/130969545/5180323.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/85261294126.pdfIn PDF document text
    • https://cdn.sqhk.co/gulanuwe/aBQhihg/barcode_scanner_price_in_pakistan.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/jfgcv5J/gediti.pdfIn PDF document text
    • http://tibudirowe.mygamesonline.org/dawulijoxuxatuzibu.pdfIn PDF document text
    • http://wijofotezopadik.medianewsonline.com/idm_terbaru_kuyhaa.pdfIn PDF document text
    • http://vudasuti.mygamesonline.org/effects_of_youth_unemployment_in_kenya.pdfIn PDF document text
    • https://xanavixigusom.weebly.com/uploads/1/3/1/4/131453194/ad3b3486ed879c2.pdfIn PDF document text
    • http://xosubowavenu.mypressonline.com/83185986655.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/5b2d617a-ba9a-4c4e-9eb8-12f59060c787/what_type_of_plate_boundary_do_compression_and_subduction_take_place.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/30476171323.pdfIn PDF document text
    • http://latuwukatagowa.epizy.com/84220809465.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/karuppusamy_kuththagaithaarar_tamil_songs.pdfIn PDF document text
    • http://wurifikag.rf.gd/telufilovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beb21980-7b68-4325-bf10-3b148dadc156/xoginabigiwadaxexopun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b837586-c192-4c71-b46a-eb289b539ccb/23006808810.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/blank_june_2019_calendar_template.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_off0000ef78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF78 5896 bytes
SHA-256: de2df6d86e7cd093d3b759229ee6c0b26c9d814f3371b909e2004bfaf44fb4b4
font_01_sfnt_off0001036c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 11012 bytes
SHA-256: 496a4f9692dede72265a69895ec4e5210adb2db67a1daf2be9afea99aa617307

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