Malicious PDF — malware analysis report

Static analysis result for SHA-256 56df80d3a37558a3…

MALICIOUS

PDF

76.1 KB Created: 2021-05-21 23:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9eccec1fd1fcacdc8129c9fde554ad77 SHA-1: 5ce284d2e291e2ca7b71820f87d5575443b25688 SHA-256: 56df80d3a37558a3d38f46b136a4a2e81a8ceb4e49e12ef1c458ded03ef88ced
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 pointing to S3 buckets and Weebly-hosted PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://kuzutuzo.ru/strik?utm_term=how+to+write+good+instagram+bio PDF link annotation
    • https://burusezal.weebly.com/uploads/1/3/5/3/135306482/d34d57f.pdfIn PDF document text
    • https://kalujobad.weebly.com/uploads/1/3/4/3/134390175/9350324.pdfIn PDF document text
    • https://davugunibelerab.weebly.com/uploads/1/3/4/6/134612729/kitavexe-zerajutekuse.pdfIn PDF document text
    • https://pakimisubimoge.weebly.com/uploads/1/3/0/7/130776027/jukuraduw.pdfIn PDF document text
    • https://kezofufilulo.weebly.com/uploads/1/3/4/4/134488682/39599c.pdfIn PDF document text
    • https://xubidanata.weebly.com/uploads/1/3/4/8/134895671/c6f5b2.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/dikobepibelun/sofujawobezado.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/56243809860.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/2007_mazda_cx-7_problems_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/50218029631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79d044d1-45d1-4e13-b0b1-6058510f6c69/91209728342.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/duwanopiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/435b7f8c-6e09-45b2-9344-68781ef42c51/zowapotibozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4281169e-5898-4c9e-b065-91962fdb69a6/map_of_the_world_continents_and_oceans.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/final_fantasy_xiii_character_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/jodojifotawezab.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/foduzerevivor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b55822a-fa18-43dd-b424-6b5437c950ac/93292100407.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/3464937514.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_off0000eae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 5308 bytes
SHA-256: ff622f66b536666e9b1740197289a824ff145a5bc3c6636804bde6f4a0c7efa8
font_01_sfnt_off0000fce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE9 11256 bytes
SHA-256: b0d24867f46dbf0a75269d788f3118e1bcbb33c39ad79574468c32dc6682da0a

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