Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a2fe6ce5557a32…

MALICIOUS

PDF

66.7 KB Created: 2021-02-18 06:07:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9444cfc12b24309c7a3e400b69d9d66e SHA-1: 8aa6606a95cfbf5336c152b102cd4f41089598b9 SHA-256: 48a2fe6ce5557a3291fbbba035a4bf6dd11aaa95ab77d346284c31264dd57e6f
184 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded links, many of which point to disposable hosting and redirector infrastructure, such as 'yafferge.ru' and 'blu-ital.space'. The document body, though heavily obfuscated, contains text suggesting a lure related to 'The amazing spider man 2 hot toys unboxing', likely to entice clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/wix?keyword=the+amazing+spider+man+2+hot+toys+unboxing In PDF document text
    • http://blu-ital.space/tegileronitemotezavolas7csim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_601b35138c8a7.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/eifidrK/finger_guns_at_high_noon_australia.pdfIn PDF document text
    • http://greatholl.com/56066825335ejrvy.pdfIn PDF document text
    • http://pigokakiw.iblogger.org/nightmare_before_christmas_live_wallpaper.pdfIn PDF document text
    • http://bnl-jobs.com/596906679637tagk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394077/normal_6010287af083b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370767/normal_5fe0b09e50953.pdfIn PDF document text
    • http://lalashoppen.online/91523486452rav9y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393209/normal_60183763bcfc3.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/vonuxagupeduze/30081321152.pdfIn PDF document text
    • http://medevigad.epizy.com/fha_guidelines_on_collections.pdfIn PDF document text
    • http://febejesibek.rf.gd/lirekitusil.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/padujedukokovomol.pdfIn PDF document text
    • http://zalaxorenisev.epizy.com/argumentexception_absolute_path_information_is_required.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/guvedagudizuja.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_off0000c7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A2 5780 bytes
SHA-256: 3a63929cb19006b814f9c175c70a56b05e210cb63d2434e150b79b48c2e23ab4
font_01_sfnt_off0000db31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB31 10152 bytes
SHA-256: b7ed32027c83884b3e9c6e6fbf36fcd4389154d7511cfc601d948203674cd4db

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