Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f4df78e9ffa06f…

MALICIOUS

PDF

87.5 KB Created: 2021-03-27 17:36:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d675a4c766bbe6d11495bef657b16ded SHA-1: 59878aeb2477cdd830260cfa1a920b36661fcf75 SHA-256: 03f4df78e9ffa06f3c9cfde5e947b7dcca6bd4682f7654b9e17553b7d68f9628
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links pointing to various domains, many of which are disposable or associated with link farms. This behavior, combined with ML and ClamAV detections, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to wkhtmltopdf, indicating it was likely generated programmatically to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://soxebez.ru/wix?keyword=strategy+for+clash+of+clans+base PDF link annotation
    • https://sazagirisama.weebly.com/uploads/1/3/4/5/134585928/winefivekevuku.pdfIn PDF document text
    • http://numulul.mygamesonline.org/lord_of_the_flies_summary_chapter_1-8.pdfIn PDF document text
    • http://biolinkus.me/what_does_infinite_solutions_mean_in_mathwkrwp.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/74248932304lt40o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411229/normal_604ee92a568a2.pdfIn PDF document text
    • http://yewes.space/unicorn_picture_editorhdwc5.pdfIn PDF document text
    • http://wemorewabadeluz.mygamesonline.org/dolafiregawigosuwuva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406191/normal_5fc90c0ec5cc6.pdfIn PDF document text
    • http://bonus332.site/jisiwojetemejudomokqp5i.pdfIn PDF document text
    • http://nijepatexosanus.medianewsonline.com/gozunabezetopudojufabevak.pdfIn PDF document text
    • https://vikabedegopeve.weebly.com/uploads/1/3/0/8/130874339/gedileraxozara-jufefalevigidod-ditedi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379032/normal_605d8e1ba5523.pdfIn PDF document text
    • http://tomandbxof.site/fejorojilusibewumukabybjz1.pdfIn PDF document text
    • http://uscovidcharts.com/sonivagads4qji.pdfIn PDF document text
    • https://vafarisitoguv.weebly.com/uploads/1/3/0/8/130874489/8455040.pdfIn PDF document text
    • http://mon-cmbretagne.com/viwilegmgpjh.pdfIn PDF document text
    • http://boost-shop.xyz/what_does_it_take_to_become_a_nuclear_physicistdyaot.pdfIn PDF document text
    • http://podarokinsta24.online/ganapathi_ashtakam_in_telugu6hba6.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
    • http://madepadejatutof.onlinewebshop.net/eureka_vacuum_cleaner_spare_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/call_ringtone_music.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/podopatawupalulikaf.pdfIn PDF document text
    • http://pojoviraxerojo.myartsonline.com/ganesh_atharvashirsha_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/kufixopejikumuka.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B99 5228 bytes
SHA-256: 0312b28138ba0023365a5916d2b2f3275500389f190e40bd263484835c6e815d
font_01_sfnt_off00011d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D55 11020 bytes
SHA-256: 8505032a3d39d075a52c68811b05d1e118e87e1b3b4bc36da06a0e9a7ac904ea
font_02_sfnt_off0001429c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1429C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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