Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d7cd71b2d5adca8…

MALICIOUS

PDF

76.5 KB Created: 2021-01-11 11:12:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1076a76eec3d641f1b718f0e304ac63f SHA-1: 85f8b32dad6f9a162581bbec6f4c5729e672123a SHA-256: 0d7cd71b2d5adca8b1e2b5226414f2014b4e68465fcdfb30eb3e4a8de3a275fa
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to '3d launcher for android free download apk', suggesting a lure for potentially unwanted or malicious software. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffmen.ru/123?utm_term=3d+launcher+for+android+free+download+apk In PDF document text
    • https://static.s123-cdn-static.com/uploads/4404287/normal_5fdda001b8b9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472206/normal_5fb4979bbc5a5.pdfIn PDF document text
    • https://gowumobajakexe.weebly.com/uploads/1/3/4/5/134585768/sowinebotenin_batoganexizig.pdfIn PDF document text
    • https://nipixosawapur.weebly.com/uploads/1/3/1/1/131164079/zovapademoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426679/normal_5fb5b39018c7f.pdfIn PDF document text
    • https://voziguwotameba.weebly.com/uploads/1/3/4/3/134345279/visokumevu.pdfIn PDF document text
    • https://xekanowodupap.weebly.com/uploads/1/3/0/7/130739303/lexupatilaxef-fazinukiduwa-zuxoziw.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/aqiduxg/rope_knot_ball_diy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/palikuvexake/aadhaar_without_mobile_number.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/escape_room_level_100-_200_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/xenisidab.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA31 5092 bytes
SHA-256: d110f42410e19c6131dcfb955d5ede99f41755e6674c1fb8ba71aba6e212a412
font_01_sfnt_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 11656 bytes
SHA-256: c89d675766bb15080bc77dd3689b933133980d5792c00d04e7a1003d1e54368d
font_02_sfnt_off0001016c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016C 16176 bytes
SHA-256: 8e4dc79afcfc60bf7591a59292f0bb7e5bb97087fc59aa1f0804fb127cd1f079
font_03_sfnt_off00011693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11693 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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