Malicious PDF — malware analysis report

Static analysis result for SHA-256 1caf0e5018ba42fc…

MALICIOUS

PDF

87.4 KB Created: 2021-02-19 11:54:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 00e7cc5b9283ee1058120fb82a49f9d6 SHA-1: feb2d9506403d76879eefc234884d01ea30c1812 SHA-256: 1caf0e5018ba42fc5cadf0a142086934026f3a04ce9fe0f43a20c68fc762ef78
184 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to be a lure for downloading a book, which is a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/strik?utm_term=quimica+organica+john+mcmurry+volume+2+pdf+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5fd637b558559.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472198/normal_5fe253f3f34e2.pdfIn PDF document text
    • http://reduslim-officialsite.site/5713035678706gbg.pdfIn PDF document text
    • http://gupupokuvugal.22web.org/dejefiwelilupobakotezela.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421611/normal_5fe6bf728345d.pdfIn PDF document text
    • http://arenaprobet.com/echo_pb_250_leaf_blower_carburetorluppr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459170/normal_602e58c2b6b6f.pdfIn PDF document text
    • http://7lessons.space/5e_versatile_weapon_featjifp9.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwuwoki/sGifI5q/bibesagonomuteguzego.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367916/normal_5fcd1ba836740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410020/normal_601b676070aee.pdfIn PDF document text
    • http://balifruit.com/nuxonowivozubufi2cgg.pdfIn PDF document text
    • http://tryadasert.online/bufibavovimejefowiz4ql.pdfIn PDF document text
    • http://koprovk.xyz/disujobimebofogumawh2nt8.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/38473569760g28yk.pdfIn PDF document text
    • http://my-credit.info/weekly_calendar_template_with_hours_excelu04ld.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421637/normal_5fdab727a8a1b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xidafusotiba.epizy.com/black_body_radiation_spectrum.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 2856 bytes
SHA-256: ede077bcf9d936b2deabd1ca36e5cf164b77d75f1467ec74ab7a8d43bb048d6a
font_01_sfnt_off00010677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 5912 bytes
SHA-256: ae4b83e937b3f27cec7512177a640b0a407dee6584cc5cf78cf3e7c93e8c7e32
font_02_sfnt_off00011a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8F 18396 bytes
SHA-256: 8bfe2a97aeacaa1c5a582cb704c74d7c1872dd1b8207f101d6ca8b5b8fc80a2d

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