Malicious PDF — malware analysis report

Static analysis result for SHA-256 c854524c76cceeb6…

MALICIOUS

PDF

69.7 KB Created: 2021-03-21 00:47:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8ac526dad907737b450a65e4ee51505a SHA-1: cac2085e2f01c7dbd54c6d82e1fb9c6d94c86d9f SHA-256: c854524c76cceeb618d05f2abc7da85d6b287ea6154e018eeec28f3742d98df1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely involving the exploitation of PDF viewers or social engineering.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pelibifir.ru/123?utm_term=nitrogen+generation+plant+pdf PDF link annotation
    • https://fatuvubexu.weebly.com/uploads/1/3/4/4/134496757/sixawonapivokox_tovuxopowitubo_lenuxuruzeb_gefemaxosovuzi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407664/normal_6007356d024ed.pdfIn PDF document text
    • http://gogejevi.iblogger.org/words_their_way_within_word_sorts.pdfIn PDF document text
    • https://lofusomibebez.weebly.com/uploads/1/3/2/7/132740423/a7ab8ddcfcb0d.pdfIn PDF document text
    • http://remontvorot24.com/50228728216a8t6u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425507/normal_60149f0f9ca76.pdfIn PDF document text
    • https://moviwinexanasi.weebly.com/uploads/1/3/4/3/134314602/donefixodejotusoromo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483854/normal_6005ec20538c6.pdfIn PDF document text
    • http://fodamibokaf.66ghz.com/gaggia_classic_espresso_machine_accessories.pdfIn PDF document text
    • http://smartroom.pro/hp_deskjet_6940_print_cartridge_status_light_blinkingarapr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b819a12-4bb0-4bea-ba08-1c2b15c9b631/gudelemolizigedabijilage.pdfIn PDF document text
    • http://dadojusox.epizy.com/godepejofuja.pdfIn PDF document text
    • http://supisaminuwon.rf.gd/washington_state_mens_basketball_coaching_staff.pdfIn PDF document text
    • http://goduzidexemave.epizy.com/comptia_security_study_guide_2019.pdfIn PDF document text
    • http://nimozan.epizy.com/33925810997.pdfIn PDF document text
    • http://purokazurawilew.rf.gd/64572053796.pdfIn PDF document text
    • http://gafejufojivu.epizy.com/xowimivugafisofagokudin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fc92c8b-0dac-4f60-988c-621e5aed2b57/rapidex_english_speaking_book_free_download.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_off0000d427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD427 5000 bytes
SHA-256: 5ebaabe4c0434a13abe14a075afaa22cf79bc83525a5d22291d39adc1923c30d
font_01_sfnt_off0000e546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE546 10764 bytes
SHA-256: a50c179b97d967c38c2b624644ccdac3027c617a9b548e32bb03ad343c5b1c30

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