Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d50fc89afeecb6…

MALICIOUS

PDF

103.7 KB Created: 2021-03-23 05:09:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d0073c829516277c577993b1e0b3dff SHA-1: 7cf6888dec3d3e3735e0def053b121e4bbe07909 SHA-256: 35d50fc89afeecb6366efacc61c31d37157fb7ce14cf6ed4f3bbc3753ce072da
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on link-farm-like domains, suggesting a SEO manipulation or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While 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

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=chiari+i+malformation+wikipedia
    • https://wixefonimav.weebly.com/uploads/1/3/1/4/131437632/tasadidilewig-kirikipe.pdf
    • https://tojalalegeb.weebly.com/uploads/1/3/4/5/134584715/papomo_furufe_nazolisinokiz.pdf
    • https://cdn.sqhk.co/tukawezezo/Pjcaifx/grass_cutting_service_cost.pdf
    • https://xadidevoki.weebly.com/uploads/1/3/0/8/130873902/d1057c1d07f815.pdf
    • https://xazepobuzu.weebly.com/uploads/1/3/4/5/134582826/afd4a2c7b82d30.pdf
    • http://sowipilarow.mygamesonline.org/17953190450.pdf
    • https://cdn.sqhk.co/senuziker/dbOz1jb/pagodarerisopijomol.pdf
    • https://cdn.sqhk.co/xedufoga/6D2PCii/jevelodajaxerun.pdf
    • https://cdn.sqhk.co/boguzivipel/djfuRgf/82493651441.pdf
    • https://pabojigu.weebly.com/uploads/1/3/4/8/134862721/32c355.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fakujijaxubet.epizy.com/jonetasotufedivebaxuvi.pdf
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_75bcd08ba6a4414f8150f24b49bc82c7.pdf?index=true
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_07e9ce2478de4acb89f040b4b3108e0e.pdf?index=true
    • http://gebezivorubax.rf.gd/fifty_shades_of_grey_full_books.pdf
    • http://nakarajibap.myartsonline.com/wuketafiwidobewegatedeb.pdf
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_0dbc0038ac0048029c4b506cae9a921d.pdf?index=true
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_fab5a59eb00741eb8c05a9213ef8e5e7.pdf?index=true
    • http://kedisijusa.onlinewebshop.net/how_to_fix_a_manual_typewriter.pdf
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_e2bae42446384c56b16d226443ce4089.pdf?index=true
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_ba36d79be7c34a57b891e62817ba4605.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015826.bin
4bffa2a785d873a2edbd5a0d54bd73fdfca370997e32904c985f8691a1e924e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15826 5164 bytes
font_01_sfnt_off0001699c.bin
eabca653a9e05c0e56ba8e76489ed777769c505c2607676ebe2d6201328f01d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1699C 12236 bytes

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