Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1ef8b411f77eaf…

MALICIOUS

PDF

82.1 KB Created: 2021-03-30 02:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 07507baeeb72516d25a7fa36699a467b SHA-1: 6b9517a50fea1d8b60fd5c55105e04cf64344933 SHA-256: 7c1ef8b411f77eafc5acf2a69f93690231cef02c784de8e769790f174a963ec9
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were extracted, the sheer volume of suspicious URLs points towards a phishing or SEO spam campaign.

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://leonvi.ru/award?keyword=mormyrus+rume+pdf PDF link annotation
    • http://buyervannakupitvsem.xyz/zukiniwuwupuzawaromxyn0.pdfIn PDF document text
    • https://cdn.sqhk.co/jigixomavola/qAgibk5/kezelusoraravanir.pdfIn PDF document text
    • https://cdn.sqhk.co/febenanedibu/pii5joL/whatsapp_status_wallpaper_free_download.pdfIn PDF document text
    • https://kekiwudegabute.weebly.com/uploads/1/3/0/8/130813612/7267726.pdfIn PDF document text
    • https://noxolawozin.weebly.com/uploads/1/3/1/4/131452883/jizuwuxax.pdfIn PDF document text
    • https://watinamubil.weebly.com/uploads/1/3/0/8/130813586/kukusesogipuxam.pdfIn PDF document text
    • https://cdn.sqhk.co/desavusomo/ijafWhg/77604149212.pdfIn PDF document text
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/fanukiworibixu_pinix_rajobowaru_roveb.pdfIn PDF document text
    • http://ejqy.com/teaching_quality_standardszuidt.pdfIn PDF document text
    • http://tlgfree.xyz/billboard_music_awards_2019_all_performancesjx4i2.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/labitajaxatufib/mevorapijumitujowuxe.pdfIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_9a2a237cc30e4dddb14477048081f34f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ccdd997-9f5c-4457-a24d-b4af7b769b06/tissot_t_touch_solar_titanium_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/lasovukugofubejol.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/personal_money_lending_contract_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/806bc332-e78f-4939-84ab-20f21db412ae/cardo_interfono_scala_rider_g4_powerset.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/donevafesetukol.pdfIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_afd17ab3571945a99647acf9169ff111.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/domoloxujefo.pdfIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_9c694590bd1c465ba5126aec436ab4ae.pdf?index=trueIn 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_off00010281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10281 5052 bytes
SHA-256: 9dbbbc67748b53a90cae5bfa2dd96397e648f1ab6274c1cb920e3dd3783b9ac2
font_01_sfnt_off000113b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B3 12076 bytes
SHA-256: 72c3c67c840cd0d41890d482d3f90ee1ecf710459a3d562a7a1d79b786858ca8

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