Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b4ec0d97c83cb2…

MALICIOUS

PDF

93.9 KB Created: 2021-05-10 05:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8a3c2af712cc9814b429e4fb79c1f09f SHA-1: 3c77aa80f4d41a7a3b8207124aa793be6319fba6 SHA-256: 41b4ec0d97c83cb23f8105b5dfd9655ec38009aca22eb4db5229c008cb59d942
244 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • 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/strik?utm_term=en+mitolog%25C3%25ADa+griega+diosa+de+la+sabidur%25C3%25ADa+y+artes In PDF document text
    • http://myfirstsite.xyz/riduwevuloxesudejeswfq9y.pdfIn PDF document text
    • http://erogan-oficial.site/billie_eilish_brother_nameihkrl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450889/normal_6032e583a8125.pdfIn PDF document text
    • http://milanbeach.fun/80339080527tw74g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374710/normal_6027a25f79ac4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487197/normal_6026090c3154b.pdfIn PDF document text
    • http://bluebadgeform.com/antisocial_2_full_movie_2015ggc8k.pdfIn PDF document text
    • https://cdn.sqhk.co/dimumaneda/jd18RLg/383303849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391623/normal_6055f8c00f7e9.pdfIn PDF document text
    • https://cdn.sqhk.co/lutumodigi/7ijiqCt/pixel_gun_warfare_unblocked_66_ez.pdfIn PDF document text
    • https://cdn.sqhk.co/sorubajuzoxe/NjjrKja/94178553265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465707/normal_601a03fcaa709.pdfIn PDF document text
    • https://cdn.sqhk.co/demexadol/ggSygcz/41901164264.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://uploads.strikinglycdn.com/files/48859a0d-5b76-4534-84e8-bec03161f757/noridunixenilalijotazuri.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/15270946585.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/microbiology_a_human_perspective_8th_edition.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_d5b998f8045a4f6bbcc60b81b5b2f08a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d72f25df-c1ed-4125-961b-d8dfc55ee7a1/are_weak_bases_weak_electrolytes.pdfIn PDF document text
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_1c422836e6034fc4a25af02be0f07a51.pdf?index=trueIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF562 5280 bytes
SHA-256: c6ef509d24320ff33abf7ea829856d31dd0d5aa8c5b3ddcf467f3791ad144ea7
font_01_sfnt_off00010738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 9120 bytes
SHA-256: 04f127aa5684a9968f45ffbce345e7fc730853c6fec6cabcc2eaa4005dc0fca9
font_02_sfnt_off000119e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E3 13788 bytes
SHA-256: 74a976d4a9ac60aad84b53ad7af9b4a220b1aa31bbb4904a48214499a96780dd
font_03_sfnt_off000145ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145EF 16120 bytes
SHA-256: 2b256ed0a859203097001e2e4d829078194c3de6c9cc768eb87b221ef26cc37d
font_04_sfnt_off00015ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AC4 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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