Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3487efa7ea5e685…

MALICIOUS

PDF

72.7 KB Created: 2021-04-03 14:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a0e9d7a7adcf7c62da419a0d1cebd402 SHA-1: 8752eb4794ac4d9ae7e8585cc66d34e20c811ffd SHA-256: d3487efa7ea5e6854df345753e1f48926122226a770bfdd0c5c3000b239d4a76
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and link farm attack. It contains numerous external links, many hosted on disposable domains, directing users to download-related content, such as 'movie downloader premium apk'. The presence of a visual download button further supports the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=movie+downloader+premium+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420748/normal_600b91f969a69.pdfIn PDF document text
    • https://cdn.sqhk.co/negixakozaxu/ggeYjiN/applock_fingerprint_pro_apk_download_latest.pdfIn PDF document text
    • http://bidimiw.sportsontheweb.net/vamebezeg.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/Ehjjh5k/dead_effect_2_apk_data_highly_compressed.pdfIn PDF document text
    • https://cdn.sqhk.co/jobiwokojo/NFmjgjj/digemifid.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/gcn2ieF/25865516960.pdfIn PDF document text
    • http://pivojowemetobiv.mywebcommunity.org/bikisagokibozov.pdfIn PDF document text
    • https://wajovojov.weebly.com/uploads/1/3/4/6/134652085/2209492.pdfIn PDF document text
    • https://cdn.sqhk.co/rowagana/jgQhghi/bijiloxopafafatanotorufob.pdfIn PDF document text
    • https://fijuvosezo.weebly.com/uploads/1/3/4/0/134096395/vadipaliwenozosoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485689/normal_5ff4b9eb0b93f.pdfIn PDF document text
    • http://kojanusipesipe.scienceontheweb.net/3146118215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_6016a97927ab1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385636/normal_5fded328ddcd4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://netawuwimirixor.onlinewebshop.net/singular_and_plural_nouns_worksheets_grade_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13ebd557-7e70-4f17-9494-ef7ef0df6755/70302135780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d980b1d7-4fd1-4f08-98d5-e7152aa7e353/76160493826.pdfIn PDF document text
    • http://filosoko.onlinewebshop.net/promissory_note_free_download.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_off0000e02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02F 5148 bytes
SHA-256: 0964fd2e404e71be5216d4110a996d1edf2646fabd2dd09beb29f3e99ec352f8
font_01_sfnt_off0000f1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 10448 bytes
SHA-256: c6239df1b3045bd534cfdbe2e22f58b38cccd987c8b210a04745c41c34710ee1

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