Malicious PDF — malware analysis report

Static analysis result for SHA-256 863e462c0fb74c58…

MALICIOUS

PDF

95.8 KB Created: 2021-02-19 19:44:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: f95549e8aae1fce333d16713af3c4a20 SHA-1: db76f2dedc8dec2fc6c0465a74998c6611e85222 SHA-256: 863e462c0fb74c5846ffc419f1087ad597def73d423b6ecb88498ec7fe3de5fa
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains an embedded URL that leads to a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a non-clustered link farm on disposable hosting, reinforcing the phishing or malware distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://seumenha.ru/strik?utm_term=resumen+corto+del+lazarillo+de+tormes+para+ni%25C3%25B1os PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501794/normal_5fd91594d6145.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411503/normal_60215c24299d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367019/normal_60252b61891c7.pdfIn PDF document text
    • http://info-pages.ru/2azj25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447878/normal_600ea33706670.pdfIn PDF document text
    • https://tivufotevomok.weebly.com/uploads/1/3/2/6/132682035/bdf2e6e7.pdfIn PDF document text
    • https://vuvonuzomuvi.weebly.com/uploads/1/3/4/5/134508102/tubin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412775/normal_5fd1c3cf5e70a.pdfIn PDF document text
    • https://tajixuxax.weebly.com/uploads/1/3/4/7/134751877/zakopo.pdfIn PDF document text
    • https://cdn.sqhk.co/kagumuzom/RNryhbG/93564169890.pdfIn PDF document text
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/8457466.pdfIn PDF document text
    • http://shopwithsale.website/rijidubamz5o6o.pdfIn PDF document text
    • http://promoocaoameericanas.com/ruwisaravugemixemuny5na.pdfIn PDF document text
    • https://cdn.sqhk.co/wepugozotap/dGCggji/dojuxekajumibojoj.pdfIn PDF document text
    • https://lexedixejorew.weebly.com/uploads/1/3/1/4/131438453/gixinebexupenere.pdfIn PDF document text
    • http://moviesaddaa.online/the_slight_edge_jeff_olson_italianokbc8n.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://s3.amazonaws.com/lolijexejomak/chardikla_time_tv_song.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/halloween_2019_movie_parents_guide.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
    • 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_off00010947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10947 2960 bytes
SHA-256: d8ef148c594adba1946aa7d95f188f3f33f69c77bc22762a1a4a57bcfd89a796
font_01_sfnt_off000113c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C9 5368 bytes
SHA-256: 8cca634814bd5c43ab6c8349278fc437528a77bbf7f692eee2afb9b20342ce90
font_02_sfnt_off000125b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B2 11628 bytes
SHA-256: 5a59477257671f2884864fb296645104218eecdfa348b3d56a0cbf3221318ccf
font_03_sfnt_off00014b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8C 16144 bytes
SHA-256: dad74f88b599b6d7b72e2a83e1de00f4701dbad928cefc6808bdf8fb3d071b5d
font_04_sfnt_off0001608d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1608D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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