Malicious PDF — malware analysis report

Static analysis result for SHA-256 d451d144a10e525c…

MALICIOUS

PDF

76.6 KB Created: 2021-02-24 15:43:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 33b5a7c584fe50f55f84736b5f0715b6 SHA-1: 9d1bf22dbcbac8fd867e7e4af4ac540cb4be3e1f SHA-256: d451d144a10e525ccacdfe02400aca75b32cad3a0d71eff88004e4c80badb0f3
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to Weebly-hosted PDFs, suggesting a link farm or SEO abuse tactic. One prominent URL, 'https://jacksth.ru/wix?keyword=zombieland+double+tap+free+full+movie+download', appears to be a lure for a movie download. ClamAV detected this file as 'Pdf.Phishing.Trojan', and a machine learning classifier also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and the high number of external links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/wix?keyword=zombieland+double+tap+free+full+movie+download PDF link annotation
    • https://tinofapilasi.weebly.com/uploads/1/3/4/5/134518201/wibowimipagegemifol.pdfIn PDF document text
    • https://senovaxevuka.weebly.com/uploads/1/3/5/3/135304629/sukobuke-dupigotomave-luwogerel.pdfIn PDF document text
    • https://cdn.sqhk.co/pulafefer/pmPxEgc/nunevogabokik.pdfIn PDF document text
    • https://wuxorazaw.weebly.com/uploads/1/3/2/7/132712222/mipobusiv_taduzetezifume_piwagejoti.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/5bhjTgg/42341292333.pdfIn PDF document text
    • https://wojaginobaxap.weebly.com/uploads/1/3/1/8/131857211/rirojukuwor.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/4e8672289.pdfIn PDF document text
    • http://instapodarok.site/45532731931y8qqe.pdfIn PDF document text
    • https://wudajelenap.weebly.com/uploads/1/3/4/4/134470879/4882902.pdfIn PDF document text
    • https://cdn.sqhk.co/zagakobafot/jbhb3ha/lost_in_harmony_original_soundtrack.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/wolina/como_convertir_un_a_word_editable.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/67195646513.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/dance_basanti_full_video_song_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/aircare_humidifier_filter_1043_frame.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_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 5260 bytes
SHA-256: cfd8134d6eff414446c0caae769b2b55a0a9ea7e2b9a74c681deded3d5d27b0c
font_01_sfnt_off00010234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10234 10148 bytes
SHA-256: b585b8c4fc44d2533ca45b00b5565c3605cd8585f4509a1a8fe8053ffe0b31a0

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