Malicious PDF — malware analysis report

Static analysis result for SHA-256 775981d67b1459fd…

MALICIOUS

PDF

79.0 KB Created: 2021-05-17 21:40:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d8f2b8c6e0d0e97eb5bfb0724eb8b796 SHA-1: ecda1069c09bd1ae3550aa4690477cce3262d723 SHA-256: 775981d67b1459fdde5f9d3bc47d0506aea4862021f2e9b4d5d93ae8385d2cce
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=how+do+i+transfer+my+drivers+license+to+florida PDF link annotation
    • https://dowusezawidi.weebly.com/uploads/1/3/3/9/133997386/52904d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427528/normal_5fe64405963c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422385/normal_601cf033f385f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483072/normal_5ff1c9d01e738.pdfIn PDF document text
    • http://kavevisukedawox.22web.org/44540693236.pdfIn PDF document text
    • http://mawejufikesiruw.22web.org/amar_chitra_katha_malayalam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470228/normal_605aab2f1b7db.pdfIn PDF document text
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/datunom-poboko-dizomusetakuxin.pdfIn PDF document text
    • http://guzanarogenuje.iblogger.org/pdf_flip_book_maker_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449599/normal_5fd8f23aedc5a.pdfIn PDF document text
    • http://vosusapar.22web.org/depur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450047/normal_6057a5efecc49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_606562a5bf84c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/3818398322.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/75824918700.pdfIn PDF document text
    • http://lokemupuwife.rf.gd/85213948965.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/bastei_lbbe_ag_annual_report.pdfIn PDF document text
    • http://xakosafejel.epizy.com/47473564464.pdfIn PDF document text
    • http://sizemedapaparum.epizy.com/bhilsa_topes.pdfIn PDF document text
    • http://fazetotunoju.epizy.com/noida_building_bye_laws_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/java_8_download_mac_catalina.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_off0000f61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 5380 bytes
SHA-256: 0ab75c7fa1539922253122c1c100e7624a00ba02440a249fffa545989b2f34ec
font_01_sfnt_off0001086e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086E 10652 bytes
SHA-256: 55d0e00f383d16d6db05827bab06d82b3dc7d78012e46642fbf891ebc1cf96e0

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