Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3d622f6a4df7fb…

MALICIOUS

PDF

72.1 KB Created: 2021-03-06 15:16:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5e648ff3be42bb09c88263ec0f1477f9 SHA-1: ab3b9ee247ee3bff079b0f45163f0016afa8362e SHA-256: 1b3d622f6a4df7fb573587959f5a1b787fcd22d7b02481316889bfe057319b06
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or a lure for malicious content. The ClamAV detection and ML classifier also indicate maliciousness. While no scripts were directly extracted, the presence of numerous external URLs points towards a phishing or content-luring attack pattern, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://leonvi.ru/wb?keyword=what%20reading%20grade%20level%20is%20magic%20tree%20house PDF link annotation
    • https://lemusovigezamo.weebly.com/uploads/1/3/1/3/131381045/makegafum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368226/normal_5ff3ef62cbe07.pdfIn PDF document text
    • http://zoosalon.org/673629936547slom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464083/normal_5ff3d9e794435.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/RyMjajd/kepedegosajas.pdfIn PDF document text
    • http://shop-you.xyz/80821306950b603y.pdfIn PDF document text
    • https://cdn.sqhk.co/vifutetax/jachhhh/29996043267.pdfIn PDF document text
    • https://kitedagipan.weebly.com/uploads/1/3/4/8/134892955/pukizazegalofu-tugosapetumozig.pdfIn PDF document text
    • https://fobizolavavoka.weebly.com/uploads/1/3/1/4/131406440/vikodexe_givif_davivenenutix.pdfIn PDF document text
    • http://allieshouseofhope.com/811309988461qk4t.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/iiDhjhh/bokujod.pdfIn PDF document text
    • http://legalvictory.group/xizotakopemewugenowiwu5b7n8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426832/normal_603a0fb7e61f7.pdfIn PDF document text
    • https://cdn.sqhk.co/dawiredi/eNeRida/duruwexiv.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/xeropizuwe/koweriduzovuzorewen.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/checkbox_style_android_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/kalegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c781851-4247-4433-8055-a5e9d4e8971f/33250980307.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/e-_newsletter_template_for_outlook.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/bimewoforug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e39774e3-b5f3-468d-b9f6-36e9b07df241/a_short_history_of_the_movies_11th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f46674f1-f8df-47a8-b690-ae06b4b69c6c/95720838499.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_off0000dc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC74 5428 bytes
SHA-256: 253b2d4225530c9e34e744691143ea81584bccb5a6d2d67e0a05e60c8340dd8a
font_01_sfnt_off0000eece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 10556 bytes
SHA-256: b038bac70e629b3d6133b33295c229aa9d136dd727965ce099bb9480309a9f0d

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