Malicious PDF — malware analysis report

Static analysis result for SHA-256 daefcd4fc9ea8e65…

MALICIOUS

PDF

76.9 KB Created: 2021-04-05 01:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: dab7bb6d473dcf0a56938c6ed6aabfa6 SHA-1: 0e7b811354d8522acca3b1b3a8a9af1eeb8eb93d SHA-256: daefcd4fc9ea8e655b08917dcfd9d643d9ce4d83e6987138037e21e32f79373d
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a technique often used in SEO link farms to manipulate search engine rankings or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URIs and the PDF_SEO_LINK_FARM heuristic suggest the document's primary purpose is to redirect users to potentially harmful external sites.

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://pelibifir.ru/123?utm_term=symbolic+logic+carroll+pdf PDF link annotation
    • https://fakanodadix.weebly.com/uploads/1/3/4/3/134371587/sopajipami-girolawogowa-votegisub-vejimuzan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447880/normal_5fce955f56d44.pdfIn PDF document text
    • https://tufagata.weebly.com/uploads/1/3/4/5/134587591/e8935.pdfIn PDF document text
    • https://vulabomanuxuw.weebly.com/uploads/1/3/4/8/134857085/kofusokisanigub-polasunixipi-xagokixetefep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421200/normal_5fd1a1bbae75c.pdfIn PDF document text
    • https://wagidojinubem.weebly.com/uploads/1/3/1/4/131438567/migemerosasok_vugozo.pdfIn PDF document text
    • https://xovelojedawoka.weebly.com/uploads/1/3/4/6/134662979/601857.pdfIn PDF document text
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/7976686.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_a29c71720f964b79a25a0073a2638e80.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/instagram_analytics_report_free.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/ringtones_free_tamil_old_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/mumek.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/54244748412.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/mupiv.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/78342209628.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/dream_on_aerosmith_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/7149729761.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/56778170629.pdfIn PDF document text
    • https://21f73b2e-5d6d-4b25-8c0c-08edb61a433f.filesusr.com/ugd/1b0481_290fa7a106a3483ea882e58cd50c2a15.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/welafaxi.pdfIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_299d006422314b6dae9c4c80fb263c60.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_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 5640 bytes
SHA-256: b6710c81c580f368ae6ecd8272852edc66dabb732a60dce4f30697714f0a32b7
font_01_sfnt_off000100e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E0 11232 bytes
SHA-256: f51d11286be8596a02cfe674387ba445b8c251bc4cade3af065a1d2d8cf43069

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