Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e3c45653521f43…

MALICIOUS

PDF

76.3 KB Created: 2021-02-24 17:10:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 16017201f4a489a6da8bcfb328bc4a5e SHA-1: 1fc79c397e8cb08cf839f2df4c3928b8e2b56972 SHA-256: a5e3c45653521f439abe957ecca77f08b8025e90df5f87360d9544d0933fc892
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though partially corrupted, suggests a lure related to guitar string names, which is used to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=cuales+son+los+nombres+de+las+cuerdas+dela+guitarra In PDF document text
    • http://qrastenmap.online/lumifitasijuxamowakivetgot9u.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/56443163732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424985/normal_602e201f797e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486535/normal_5fd1fc1df3dcf.pdfIn PDF document text
    • http://operationhomeplate.com/quran_arabic_and_english_translation_and_transliteration_book81rvh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_60180fce38aaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498992/normal_5ff8965415f83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410674/normal_5fe794575140d.pdfIn PDF document text
    • http://hh666o.site/35539958842ousrr.pdfIn PDF document text
    • http://pollsexpert.com/jomepisewixonirezasndoq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470703/normal_60238e3091399.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/aswb_practice_exam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484609/normal_601f8a3540fb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367650/normal_5fc80de274f70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380070/normal_601839906bea2.pdfIn PDF document text
    • http://znatural.space/favigarewumevokarimobx1t49.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/woxorojero/xexupasiji.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/cochise_stronghold_climbing_guide_book.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/manugerag.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/feritaduzutiri.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_off0000e829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE829 5304 bytes
SHA-256: f7effb80cce69e3b13fb84fd8dbe9f920c0e94050cf50531dab83b6b48da8f07
font_01_sfnt_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 12040 bytes
SHA-256: fd9492269ed01e0d61bc44898434bb9ce38c7b3f574a7d545fdc28aa3015a4e2

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