Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf07386688929b04…

MALICIOUS

PDF

78.1 KB Created: 2021-03-25 06:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8b3bb2fdf4f17f7b9a655f21385255a SHA-1: ea9f7f8e174fb729940c8b5afccbc0322e05e492 SHA-256: bf07386688929b04c4ea9a6628587f7b755718bea306694787bb327f5c252a7c
186 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many of which point to disposable domains or are used in a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/strik?utm_term=ejemplos+reales+de+estudio+de+factibilidad
    • http://venira.su/avengers_4_movie_in_tamil_hdnnm00.pdf
    • http://fapseo.ru/tazoveluvapodeduvupew7ul7.pdf
    • http://mozujana.22web.org/kajuwedujulelaledul.pdf
    • http://lakegefufen.scienceontheweb.net/reacciones_quimicas_de_alcanos.pdf
    • http://netopodimamo.mywebcommunity.org/57004702470.pdf
    • http://wapividazofar.scienceontheweb.net/zovefi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_9128035add5645949d5407af44b6694b.pdf?index=true
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_0239228b49ac40b9a5cfe7db54e08d1a.pdf?index=true
    • http://gixopiv.onlinewebshop.net/biggest_loser_diet_plan_free.pdf
    • http://jamekatenevo.rf.gd/benop.pdf
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_bb53262a66894bab8440ba0b93a83578.pdf?index=true
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_966d92be97db44018e73950f10e22351.pdf?index=true
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_d963d6fbe6504c1991ced683ad05e9bb.pdf?index=true
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_29f59f7e6b47471a8b2598d017703c43.pdf?index=true
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_ed8cc85785124e3cb00cf673119dbf7c.pdf?index=true
    • http://botasalipigu.epizy.com/canberra_university_course_guide.pdf
    • https://e19809cf-df80-48c1-9975-8599b001ad7a.filesusr.com/ugd/062cdf_9d2f53046bd443ba9426dff5b7418829.pdf?index=true
    • http://binuxoxu.rf.gd/82376126207.pdf
    • http://dikifewusexo.rf.gd/wemupigetepidamafek.pdf
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_fa71bc9d562f49c7bb10c7ae44989ae1.pdf?index=true
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_d6d92e0642e849c2bf8f5346d907ac7a.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f117.bin
7221326f0eb2518a469a92d163544c18e7334e890aa1f0dd16334970d1553116		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF117 5472 bytes
font_01_sfnt_off0001039f.bin
c01711bcfb647e9136060abf49358c095a933e1b005f9fcf39fec557f54ada8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 12120 bytes

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