Malicious PDF — malware analysis report

Static analysis result for SHA-256 959c39f8b6be606f…

MALICIOUS

PDF

77.1 KB Created: 2021-05-08 23:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d74297cec5bf86cb9eafbc6a42cbe5a2 SHA-1: 21b1782a1db38405ecbd725cb4ca847ea2fb8d3e SHA-256: 959c39f8b6be606f2fe5ba0b5069c387a5410bd1912b2f7d1265e406d9465d68
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=how+to+pair+gosund+smart+socket PDF link annotation
    • http://mivegik.mygamesonline.org/58512662264.pdfIn PDF document text
    • http://fallofelin.online/44552199340mhddt.pdfIn PDF document text
    • http://yesitalia.fun/faulty_product_reportcoc8o.pdfIn PDF document text
    • http://mailedflkf.site/b._ed_form_in_up_20197r14b.pdfIn PDF document text
    • http://swast-group.website/21582428594vkhyl.pdfIn PDF document text
    • http://davupopebuwiser.sportsontheweb.net/58264009413.pdfIn PDF document text
    • http://tejovotemikodes.getenjoyment.net/the_american_idea_by_theodore_white_answers.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/pokezuteneziweborupovedotsl58b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zenutetuzobo.epizy.com/light_my_fire_organ_intro_sheet_music.pdfIn PDF document text
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_a73d3cddf6214a2f91dfe4863fffff6d.pdf?index=trueIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_d2933843d35b4f4aa532e895d7ab337d.pdf?index=trueIn PDF document text
    • http://dezezefisimel.rf.gd/bengali_hit_old_song.pdfIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_4dd85673af964687acc6805f24fc9ac9.pdf?index=trueIn PDF document text
    • https://dce579ed-4708-43c3-aaeb-2c76a6268d78.filesusr.com/ugd/944939_1f06e85b9d93469d82c634352aee484c.pdf?index=trueIn PDF document text
    • http://mupegutiwigo.epizy.com/738669699.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/simplicity_snowblower_repair_near_me.pdfIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_69befe40112f4d078b4a56f6cd839a2a.pdf?index=trueIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_a9113c916d974fa4b4d098a3f423c65b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zewimu/blender_books_amazon.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF34 5480 bytes
SHA-256: 03b830e0ff0db3f030314dac626e94ad66958cdec4f16ae0ab3d9387e8d8e59e
font_01_sfnt_off000101d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D6 10276 bytes
SHA-256: 23c055149f40c616f61644d208eef53d41a774aa6f85c9a44f91cb412d7405b9

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