Malicious PDF — malware analysis report

Static analysis result for SHA-256 755655b8f94300bb…

MALICIOUS

PDF

113.5 KB Created: 2021-05-30 21:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bcdb0393f85d870b54b80d1c82830297 SHA-1: 6c4c5aa63783d940dd7bbfef3185630c2d1ad798 SHA-256: 755655b8f94300bb31477c717f6ed877a216911628cdd0c76b0d8f221d5e45ea
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely leading to credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/123?utm_term=blackpink+concert+in+seoul+dvd PDF link annotation
    • https://tezigawoje.weebly.com/uploads/1/3/1/3/131379443/6387515.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450733/normal_5fcbdefc47342.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419206/normal_604d1f834a838.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467955/normal_604b625f1f95c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488566/normal_604a83b8a46d5.pdfIn PDF document text
    • https://titapogesasoja.weebly.com/uploads/1/3/1/3/131380181/fakakojaj-vorodopaloz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485157/normal_5fc8bacd2bc5b.pdfIn PDF document text
    • https://wusudomujud.weebly.com/uploads/1/3/7/5/137517937/091b5fc00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450746/normal_5fee1b3224e8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489596/normal_5feb46fc9484a.pdfIn PDF document text
    • https://jedirixaz.weebly.com/uploads/1/3/4/8/134875163/xexaxe-guperusejuwak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470968/normal_5feec50447037.pdfIn PDF document text
    • https://nulevilisibonu.weebly.com/uploads/1/3/4/5/134585613/5aae5fbe1cbe350.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464314/normal_5fee8de4efb20.pdfIn PDF document text
    • https://zaridonuxubotu.weebly.com/uploads/1/3/0/7/130775126/suponavifolezit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccd8f78a-d5e5-4b2a-94c5-9531d5200583/xadureboj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01144697-75a7-4b4c-a035-b0964a91da21/zutadarivanifudareg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eb7e3ec-3e54-4b08-b073-217f7ee7ebfb/john_deere_lawn_tractor_l108_parts_online_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97e8449f-b0c9-4d76-b52a-56acacdb98df/music_for_sight_singing_10th_edition_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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF87 32368 bytes
SHA-256: 6784d9bfd7f846a50cd56a8183e54c3fd4acc2226b271ae148e53ffbabd5eeb8
font_01_sfnt_off0001642b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1642B 5240 bytes
SHA-256: 3d306962f312cad8aa3c0388b0ac19d2356eb799f744046fe31bcdde9b780a44
font_02_sfnt_off00017616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17616 13200 bytes
SHA-256: 9b7c2acfa3459e138aa1723511bfb9ca620ce0ce2e595f0cb9ca65a3822e9bd9
font_03_sfnt_off0001a1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1A5 16092 bytes
SHA-256: fb56bd761fc943f7616d05fbf77dc79b3c17d623a1a65e3a3240b0ca62a8c50f