Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b71cb215f44a45…

MALICIOUS

PDF

78.4 KB Created: 2021-02-25 00:58:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 869445f8535687d46993efa246b34d39 SHA-1: 66eb40a3cd3231632f87055e323d392842876cc0 SHA-256: 03b71cb215f44a45316e022eb87fd0baae30d7bd313a3d5f72abdee983049767
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of the 'utm_term' parameter in one of the URLs further supports the idea of tracking user interactions for malicious purposes.

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://jottigo.ru/123?utm_term=does+strength+training+require+weights PDF link annotation
    • http://manovina.mypressonline.com/33110616160.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446494/normal_5fef1ae5d1653.pdfIn PDF document text
    • https://gokulibom.weebly.com/uploads/1/3/4/2/134266198/pasutu.pdfIn PDF document text
    • https://bivawufixusu.weebly.com/uploads/1/3/1/4/131453301/5bd4b1e96bac.pdfIn PDF document text
    • http://golixudib.mypressonline.com/kegividejeda.pdfIn PDF document text
    • https://togawikanow.weebly.com/uploads/1/3/5/3/135320583/vigusumetad-pekijabad-dinizavewulezo.pdfIn PDF document text
    • http://naliputa.mywebcommunity.org/16118959089.pdfIn PDF document text
    • https://dugaxopi.weebly.com/uploads/1/3/5/3/135305828/d98dcae7be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492875/normal_5fd789cd4f470.pdfIn PDF document text
    • https://pepibugogik.weebly.com/uploads/1/3/1/0/131069762/rubadikuwekisas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481282/normal_5ffdda37d6df0.pdfIn PDF document text
    • https://vinedenakebuz.weebly.com/uploads/1/3/6/0/136020142/wixugibefif.pdfIn PDF document text
    • http://xefapase.iblogger.org/android_listview_adapter_notifydatasetchanged.pdfIn PDF document text
    • https://muwevowaxa.weebly.com/uploads/1/3/5/9/135992822/wajifadalaxub_damaweba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415770/normal_5fccc6cc51c69.pdfIn PDF document text
    • https://rofoxanubojinud.weebly.com/uploads/1/3/2/7/132740779/virirujudotataw-xugosox.pdfIn PDF document text
    • https://sofifego.weebly.com/uploads/1/3/4/8/134899758/8e1cb74c8d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvarijes.atwebpages.com/what_are_good_topics_of_conversation.pdfIn PDF document text
    • http://zunimesigo.rf.gd/50610198099.pdfIn PDF document text
    • http://tokafibalo.epizy.com/background_video_effects_hd_free.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_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 5132 bytes
SHA-256: 4447da2150359acfabedec85d66a3bfc0bb37557349f37320426eb95b9ee2bac
font_01_sfnt_off00010924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10924 10188 bytes
SHA-256: b01b0d774590a15bc91b619d39b77c327d95c788ad5564ea8d650af65547700c

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