Malicious PDF — malware analysis report

Static analysis result for SHA-256 88850d51b0d339f7…

MALICIOUS

PDF

91.7 KB Created: 2021-02-18 18:55:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fe2b7c67521d50f7ab7ff153bf71cb4b SHA-1: c3a0f7de45aa3cd1557418a007d586009167bed9 SHA-256: 88850d51b0d339f7fe916f11083bbdb85d516f05872d6c059a683db804abe08b
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, many of which point to PDF files hosted on services like Weebly and AWS, suggesting a link farm or SEO spam operation. The primary URL, 'https://jacksth.ru/wix?keyword=earthbound+text+box+generator', indicates a lure to a website disguised as a content generator. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest malicious intent, likely for phishing or driving traffic to malicious sites.

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://jacksth.ru/wix?keyword=earthbound+text+box+generator PDF link annotation
    • https://xejotonevuxujuj.weebly.com/uploads/1/3/1/3/131379732/wolowirulojafog.pdfIn PDF document text
    • https://fasilusizewolas.weebly.com/uploads/1/3/5/3/135313848/lavur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413718/normal_5ff56cae42833.pdfIn PDF document text
    • https://cdn.sqhk.co/wanaxowuwot/iccihgi/songpop_2_ending.pdfIn PDF document text
    • https://zedowami.weebly.com/uploads/1/3/1/6/131637063/cb66fc1aa9.pdfIn PDF document text
    • https://fakegegi.weebly.com/uploads/1/3/5/3/135312823/mevuti.pdfIn PDF document text
    • https://jolibudowuw.weebly.com/uploads/1/3/4/5/134596284/331d7.pdfIn PDF document text
    • https://tunogurepuxi.weebly.com/uploads/1/3/6/0/136054619/davufomufasenidema.pdfIn PDF document text
    • https://sadejakudabad.weebly.com/uploads/1/3/5/9/135965210/6338517.pdfIn PDF document text
    • https://cdn.sqhk.co/xanapaje/tIhb4ew/boba_tea_recipe_from_scratch.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/kuxegu/abcd_2_movie_song_tinyjuke.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/resume_template_word_for_teacher.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/arma_3_grenade_launcher_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/41766297942.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_off0000fca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA5 6564 bytes
SHA-256: 315068d21fee91b8af6b262adf305436342c2d370a2656dfb573b95012c7dff6
font_01_sfnt_off00011312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11312 5040 bytes
SHA-256: d79887754dcf5d0174155a3c7191d6a360c8bec91dc93e0960e6758c8069c0be
font_02_sfnt_off00012432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12432 12100 bytes
SHA-256: 741e105281ac276c9420aaf91798261a060c098f4db0d5820c578c21963e7fea
font_03_sfnt_off00014aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA6 16116 bytes
SHA-256: a3e0371487a6ea36dc30479bb3f7d3d31805742e47025fb0c7a52a71d9cc1b5b

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