Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db58fe6a1f3d28f…

MALICIOUS

PDF

69.3 KB Created: 2021-02-15 14:50:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f2ae6e5666b3417d3557f35571365237 SHA-1: d6b69d8b53152065c69ea187be9a8465f7b1c79c SHA-256: 8db58fe6a1f3d28fb45b867fdc6e44974f9a0189224d2a7b58220bfe900bf76c
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including suspicious links and link farms. The presence of embedded URLs and the ML classifier output strongly suggest this PDF is part of a phishing or malware distribution campaign. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://crophysi.ru/123?utm_term=what+are+the+foxfire+books PDF link annotation
    • https://nedudefo.weebly.com/uploads/1/3/4/3/134389218/gawekasaroramo_kerigusesase.pdfIn PDF document text
    • https://niwanuve.weebly.com/uploads/1/3/1/4/131406473/4327089.pdfIn PDF document text
    • http://hd-cam-mirror-up1.club/xipuxisukerolosodorvviox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417531/normal_5fcbd76d6bd5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369935/normal_5fdb9247ab950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496148/normal_5fe628f19983a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408197/normal_60026c425fe30.pdfIn PDF document text
    • http://ig-supportcenter.xyz/769392835946qacm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488116/normal_6012b988c1de3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388426/normal_5fc826f9e3fdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472221/normal_5fe64b193ac99.pdfIn PDF document text
    • http://reduslim-shop.website/zalo_vt_qu_s_request_cho_phpg089z.pdfIn PDF document text
    • http://tiktokhd.design/5451464381i4l0q.pdfIn PDF document text
    • https://balolenitazir.weebly.com/uploads/1/3/1/0/131071159/2586a66a6de.pdfIn PDF document text
    • https://lekamenofujilap.weebly.com/uploads/1/3/4/6/134690267/godutozeluvexu_denepezul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/49568944210.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/25114091662.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/92181056972.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/8553483890.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_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 5108 bytes
SHA-256: 7df33c1fcb13175c6955683fde3ef05f6f367c495a75a7b35ef941585555d39a
font_01_sfnt_off0000e463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE463 10588 bytes
SHA-256: a1dd9a60da983afcf34007261287ea07e479058ec80d59f206f206e531234562

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