Malicious PDF — malware analysis report

Static analysis result for SHA-256 4916bbb4e4047a7b…

MALICIOUS

PDF

69.1 KB Created: 2021-02-13 13:08:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b16392fa560e7c2617edfd044d23bd40 SHA-1: a51a77d010bf535dce42b5435a63c46c221f4c34 SHA-256: 4916bbb4e4047a7b9acb8eba7b24745d4b231df47f0888ced1be352f6d177a53
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on external domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it acts as a dropper or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=modified+side+plank PDF link annotation
    • https://girawosanisab.weebly.com/uploads/1/3/0/7/130740609/tukafejukeki.pdfIn PDF document text
    • http://xakerof.22web.org/56322182390.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479925/normal_5fe5ad713f5ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490251/normal_5fdc29fc186a9.pdfIn PDF document text
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/nelonejuwaborifob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454303/normal_5fcd576d30bac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416919/normal_5fd7b3d381f90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424400/normal_5fffb5365e274.pdfIn PDF document text
    • http://axecheat6.xyz/anbae_per_anbae_song_free7zu7j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454435/normal_5fc87c500330c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457000/normal_6013a8a3d50cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475572/normal_6005e61945b42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375716/normal_5fd1786cd9e2a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sobegomogi.rf.gd/caterpillar_drawing_template.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_off0000d2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DB 5008 bytes
SHA-256: 71a4ac755924af4e3bc2a7e2d6a73a57f65a626ab80465d8231405acf808d10d
font_01_sfnt_off0000e40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40C 10464 bytes
SHA-256: e94925e56be2c1971db6b208e8248ef97ca7f6b9b034a2b36a13be9916b6f433

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