Malicious PDF — malware analysis report

Static analysis result for SHA-256 2afd87a08c75fa6e…

MALICIOUS

PDF

79.5 KB Created: 2021-03-15 23:33:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1595efcca5c720cd6bb6712b26dff3ed SHA-1: 16a4e4474cdb5a1b7f39f6f157227d70a90a4616 SHA-256: 2afd87a08c75fa6e2c0eabe14438224e6f8a3627fd27f641089f965469b2ecb5
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a mass external PDF link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a generated document used for SEO spam or phishing lures. The primary attack pattern involves luring users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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/wix?keyword=peter+caine+dog+training+location In PDF document text
    • https://cdn-cms.f-static.net/uploads/4445890/normal_604bc12793205.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446285/normal_5fdb0fb643834.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459936/normal_6002e1d634143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455898/normal_604c97941ba2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450876/normal_6028ea8f24342.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404959/normal_604a1396eff57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448110/normal_5ffa403c8925b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460706/normal_6007fb4f45b42.pdfIn PDF document text
    • http://tisapizur.iblogger.org/momepuguforoxoxomo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_602221cf68435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486534/normal_601ebf270dd90.pdfIn PDF document text
    • http://wevoselaxoto.66ghz.com/capitalize_web_chicago_manual_of_style.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486563/normal_5fdf948a8c819.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fipiwafupogo.epizy.com/tasobajejenajomapebesame.pdfIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_a98d6003c4ff49e39fe0ad2a0aa1d71a.pdf?index=trueIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_2f0351c5417249389633d7126ab0b40b.pdf?index=trueIn PDF document text
    • http://fuzadakeju.epizy.com/rapidex_english_speaking_course_free_download_file.pdfIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_95dc7c2ecf9640f5895e3396074378f9.pdf?index=trueIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_fcb97c6b5547497382bc07f7da3ae848.pdf?index=trueIn PDF document text
    • http://kufekuduvedeni.rf.gd/fundamentals_of_communication_systems_2014_edition_free_download.pdfIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_3d215ef565de4cc382a12dd926463099.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gupojakami/how_to_find_p_value_from_z_on_ti-84_for_two_tailed_test.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/zufexozedadiwalebife.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/forex_hedging_ea.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/m2n68-la_motherboard_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/simple_probability_notes.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_off0000fa4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 4932 bytes
SHA-256: ab3fda3ebd3ca80136ebeefb405f8187d0d5aa44d34c16b9e75690d6dec39361
font_01_sfnt_off00010b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B23 10920 bytes
SHA-256: d245ab943af65f4b7b6b31da84291b46acdfaba286f1e82cd18c72f487260e40

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