Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6142e782f99baab…

MALICIOUS

PDF

73.0 KB Created: 2021-02-24 09:09:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e80baf1b7bd3d630f8fe1fc953d78b43 SHA-1: 59fc0dec966a264c767ea07d24dbcd6958e9fc88 SHA-256: e6142e782f99baab0408b0d088833e2382c853a371532a3da2fd2821cff4b34c
146 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating a malformed exploit stream and a link farm on disposable hosting. The embedded URLs and the document's structure suggest it is designed to redirect users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://druttle.ru/strik?utm_term=how+i+became+a+pirate+preschool+activities PDF link annotation
    • https://cdn.sqhk.co/xovikojux/ZjiJxjh/griswold_inn_store.pdfIn PDF document text
    • https://murufafutebe.weebly.com/uploads/1/3/4/4/134473477/3d1c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494648/normal_6024a84fd0f9c.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/dhaoz8U/refudamo.pdfIn PDF document text
    • https://cdn.sqhk.co/mufipofunup/jbxIFid/74279927485.pdfIn PDF document text
    • https://ferijivoko.weebly.com/uploads/1/3/5/3/135327637/banonegeben.pdfIn PDF document text
    • http://7lessons.fun/free_download_asia_empire_2027_mod_apkungm7.pdfIn PDF document text
    • https://jerepukiw.weebly.com/uploads/1/3/2/6/132681878/20faf804b8b.pdfIn PDF document text
    • http://elerctum.org/what_truck_delivers_usps_packages9x4o1.pdfIn PDF document text
    • http://wanebiwadu.iblogger.org/63383023244.pdfIn PDF document text
    • https://viliwefat.weebly.com/uploads/1/3/1/0/131069961/285462.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/gjdicdK/pet_heroes_puzzle_adventure_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/vonezositixi/aPlyEic/33199098547.pdfIn PDF document text
    • http://zahlungsservice-ch.site/gawilajurapvbbuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://numowun.rf.gd/kimyasal_bileik_formlleri.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_off0000de77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE77 5424 bytes
SHA-256: 13bf8c6d47024e16fbd419285e256c86d0526a6834d29d1ec560108f4edda757
font_01_sfnt_off0000f0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 11796 bytes
SHA-256: c773e7a3a1aead12c9c4627b475bf459d6fc1ec1985a82971688b4d9a73301da

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