Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d962bd63a13c1b1…

MALICIOUS

PDF

73.0 KB Created: 2021-05-24 22:39:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a33dfde82b77deaa1bc9bbf53d282021 SHA-1: 23b10f54946cb89468685719cb508c50899358ab SHA-256: 0d962bd63a13c1b152cc79402818ba9ae1040e85fed779c496530b03b2d217d5
156 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. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL related to 'how to make rules on a discord server', suggesting a lure for phishing or malware distribution. The presence of a large number of external links, many pointing to PDF files hosted on various platforms, indicates a potential link farm or distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=how+to+make+rules+on+a+discord+server PDF link annotation
    • https://gozawufi.weebly.com/uploads/1/3/1/3/131398332/dimuvapiwezop_zufelemuweladuw_pesab.pdfIn PDF document text
    • https://fesimubigezati.weebly.com/uploads/1/3/4/5/134515628/a62f8ef79b.pdfIn PDF document text
    • https://gomemaliji.weebly.com/uploads/1/3/4/0/134040406/7a64f.pdfIn PDF document text
    • https://lujuvikib.weebly.com/uploads/1/3/1/4/131406806/mojovuvubojo.pdfIn PDF document text
    • https://lexizade.weebly.com/uploads/1/3/4/3/134368494/batefav-nokafoduvu.pdfIn PDF document text
    • https://bufotikebejunut.weebly.com/uploads/1/3/1/3/131398235/giferejapufetudo.pdfIn PDF document text
    • https://bazojarazete.weebly.com/uploads/1/3/4/6/134650598/xelimosejixex_sipari_wutikosuzixiwix.pdfIn PDF document text
    • https://rapironid.weebly.com/uploads/1/3/1/3/131398378/lideridekiji.pdfIn PDF document text
    • https://surexirubale.weebly.com/uploads/1/3/4/0/134000129/1fc70c8c546bca7.pdfIn PDF document text
    • https://xagajopudulu.weebly.com/uploads/1/3/4/6/134697977/vujusadibup.pdfIn PDF document text
    • https://nokojuponamipi.weebly.com/uploads/1/3/4/8/134891784/gasamawaribarokeka.pdfIn PDF document text
    • https://mawosamaretezij.weebly.com/uploads/1/3/4/8/134860838/f9435fb.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/bufexa/cub_scout_webelos_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abf5479d-56db-43ee-b57b-6f6dd940b2e0/nalog.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/arthdal_chronicles_ep_18_eng_sub.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/wow_queen_azshara_heroic_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28602047-0cb3-4e9e-9579-dcf222a2e1e0/34365466119.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/pioneer_deh_x6500bt_manual.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_off0000dfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC1 5264 bytes
SHA-256: 4cf8de8ed2fbb658cd92f48297f4b5687105d6adcce0aee92b89a945329c733e
font_01_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 10764 bytes
SHA-256: 4ae8d145d2b668254994e05bf962c9da141d9298bb64e119da621f9bd05a96c5

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