Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1561719522b65f…

MALICIOUS

PDF

78.1 KB Created: 2021-03-10 11:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 272469850cd662e7b2e2d6eb37ded03a SHA-1: 2bd1a6fbf8e03b64d894a22f67ee9f237f5c1158 SHA-256: 7d1561719522b65fb18fac0c654210856e03643bb3929e964df7c0f119c2fa8a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/award?keyword=statistical+hypothesis+test+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408172/normal_603545d6b38a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488316/normal_602aa18487c68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_6031faa45bae0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385021/normal_5fe09222ec155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382953/normal_5fe66aa21649b.pdfIn PDF document text
    • http://ganitigusawev.mygamesonline.org/a_thousand_splendid_suns_symbols_and_motifs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371025/normal_5fcdd43b10b75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377679/normal_5fcc2e108e74a.pdfIn PDF document text
    • http://fitit.space/bikoxopubu6bdb2.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/ziwajago.pdfIn PDF document text
    • http://monstergym.ru/56765909106ki3kk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_60257b3fdd9c2.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://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_c879dd3bdd2d4180a01731f27b21512e.pdf?index=trueIn PDF document text
    • http://sagisat.rf.gd/93027520724.pdfIn PDF document text
    • http://sopavame.onlinewebshop.net/pelanedifomajure.pdfIn PDF document text
    • http://wedosop.rf.gd/can_i_stream_hbo_max_on_apple_tv.pdfIn PDF document text
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_f1bb549a609e47a099e7098d319636a2.pdf?index=trueIn PDF document text
    • http://sulanulug.epizy.com/35125254584.pdfIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_db8d5ca014e94b22b7aa7d49b6a326d4.pdf?index=trueIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_454e96c1aabb4858a850ef0a63ac3806.pdf?index=trueIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_c626015a97234b6baebc333896dcda9f.pdf?index=trueIn 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_off0000e89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89F 5036 bytes
SHA-256: 3428d010365e35fa0e694f40f6cf100e8512e4232bfe8b2d17048623606fbf30
font_01_sfnt_off0000f9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C5 10256 bytes
SHA-256: f04f8d8d02575fbaec939292ff86a33d6d5e6a6c3b76d4d0b4e7d283fd5acc44
font_02_sfnt_off00011ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE4 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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