Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07590c992c59405…

MALICIOUS

PDF

77.4 KB Created: 2021-03-09 23:25:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b753abe5e4bb236c3eb866a959012608 SHA-1: 870c649ad3a96095dfc5a2e67c1dff2d4b81e00d SHA-256: f07590c992c5940597550595707f20fbbb4ca866e991a61f69942780be470785
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The primary URL, 'https://vilenefex.ru/strik?utm_term=how+to+clean+the+front+load+washing+machine+gasket', is presented as a guide but likely serves as a lure to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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
  • 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.
  • 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://vilenefex.ru/strik?utm_term=how+to+clean+the+front+load+washing+machine+gasket PDF link annotation
    • https://tezefidusipenu.weebly.com/uploads/1/3/1/8/131857758/kujegukunomafawe.pdfIn PDF document text
    • https://denuxikunoleluj.weebly.com/uploads/1/3/4/0/134018299/3680072.pdfIn PDF document text
    • https://wojanoxunoliwam.weebly.com/uploads/1/3/5/3/135394081/vubafemiwokaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/lixipadiwel/72bSjiG/bc_high_school_hockey_twitter.pdfIn PDF document text
    • https://voxonexagigiwal.weebly.com/uploads/1/3/5/3/135346225/wabivasulenuk.pdfIn PDF document text
    • http://lg-copyright.com/tepotedurn47hb.pdfIn PDF document text
    • https://vidafaloduwi.weebly.com/uploads/1/3/4/7/134716621/xagigowogewan.pdfIn PDF document text
    • https://fumitalabojaluk.weebly.com/uploads/1/3/5/3/135399187/riwilusoxufewofofi.pdfIn PDF document text
    • http://biomanua.website/59735074880qf965.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/ipgdoWr/jakonujenekefanesow.pdfIn PDF document text
    • http://copyrightnotice-ig.com/siforenitawulixzcwqp.pdfIn PDF document text
    • http://xovijezup.mywebcommunity.org/nexis.pdfIn PDF document text
    • https://nozijuga.weebly.com/uploads/1/3/4/6/134698325/b4d6ecfd6.pdfIn PDF document text
    • https://vuzizakepavojen.weebly.com/uploads/1/3/1/4/131484090/6410437.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_77959969018648b1a1c89a560b4ea311.pdf?index=trueIn PDF document text
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_1842e14028294fe5890db2c142213424.pdf?index=trueIn PDF document text
    • http://jatoxat.atwebpages.com/lenovo_g50-80_ram_ddr3_price.pdfIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_bdb2bee1581448cfa6fe2602c910c21d.pdf?index=trueIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_b65ddae83744456787dff9a653c673ee.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 5552 bytes
SHA-256: b40ddf44dbaa8a062919f8eaa4a748143e4de2b95d573691566f3a5d80593374
font_01_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 11472 bytes
SHA-256: 5f9a763d1b32e1b9f0284ad18117a549cddfa2e153d4a5a8684fc15f6c688851

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