Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df2de1e317b114f…

MALICIOUS

PDF

73.7 KB Created: 2021-02-15 00:54:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0cf9ee3a16e1490029c1f7f7e5ea22dd SHA-1: 2e7afe4d00b600bde4c0327c73fb9cc265151c86 SHA-256: 8df2de1e317b114ff143d35003d2bc8d17cdbd4c7733aff69f01b9752869491d
192 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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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
  • 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=wifikill+protector+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_5fea41b7ba016.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383916/normal_5fc9774a38c25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467038/normal_5fda85ef35ac7.pdfIn PDF document text
    • http://rukozhop-guide.com/dialectical_journal_word_templatexm229.pdfIn PDF document text
    • http://vomenelavive.22web.org/63794025556.pdfIn PDF document text
    • http://trokot-tonirovka.online/exercices_argumentation_3mewvkdx.pdfIn PDF document text
    • http://lesantyqas.online/compound_sentence_lesson_1d_answers4eul9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://witefuru.rf.gd/nukamixunulanilabejetiz.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/tsc_bartender_software.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/penguin_readers_level_2_vk.pdfIn PDF document text
    • http://jisufuwoj.epizy.com/nintendo_online_account_information.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/xalujavisiredopomaxafalaj.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_off0000e4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 4908 bytes
SHA-256: 8f76e3c282a5cb0b883702795cd75a0ca9bcac23809d8518f50ac9a80d428d59
font_01_sfnt_off0000f5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 10716 bytes
SHA-256: 310a29510c35bd35b1f9fcba96fd464671912cac1720fa613e577df616026742

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