Malicious PDF — malware analysis report

Static analysis result for SHA-256 28cbf0ed3255d600…

MALICIOUS

PDF

70.9 KB Created: 2021-04-30 09:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dab4730fffd98911db698bb2b3160220 SHA-1: 0847d8a7bc0651f5896f4cab9af1cc01c8fbe294 SHA-256: 28cbf0ed3255d600a80631fe977ce3a34d5cbe713f7e3538016e891342965d23
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, suggesting an attempt to drive traffic to potentially malicious or ad-revenue-generating sites. The presence of embedded URLs and the structure of the PDF point towards a phishing or SEO manipulation tactic.

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://gimoguvi.ru/strik?utm_term=master+handbook+of+acoustics+sixth+edition+6th+edition PDF link annotation
    • https://cdn.sqhk.co/tabuguran/eNcD7B0/65489642863.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/ig3Jxc5/dujumimuro.pdfIn PDF document text
    • https://cdn.sqhk.co/jalotenabo/jgjc3gd/fuwawiguf.pdfIn PDF document text
    • http://ditoterelutas.sportsontheweb.net/jafagumomula.pdfIn PDF document text
    • http://jisetatiloro.scienceontheweb.net/55364706883.pdfIn PDF document text
    • https://patosalar.weebly.com/uploads/1/3/1/3/131384166/wabazoso_miwoxejisos_puwekan_kazenulaw.pdfIn PDF document text
    • https://wilumixomili.weebly.com/uploads/1/3/1/4/131483065/bukarizuz.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/lNHhiij/real_cat_sounds_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wafavalufa/ibdjghb/purevuzinonajerodezinol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedojaji.epizy.com/79617839911.pdfIn PDF document text
    • http://jekopavopi.rf.gd/the_historical_origin_of_islam_walter_williams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee18c391-8234-46f9-8111-4bb5acebd292/how_to_start_ios_development.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/422308e9-0a61-47ce-adad-c6b71dead167/balonimowitar.pdfIn PDF document text
    • http://pojoviraxerojo.myartsonline.com/mean_median_mode_and_range_lazy_song_parody_lyrics.pdfIn PDF document text
    • http://zupupizejegujun.epizy.com/12065326554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aac0b139-1190-4b5b-b1cf-8ab1a7608f6c/wijedetudilel.pdfIn PDF document text
    • http://junimuji.rf.gd/besuz.pdfIn PDF document text
    • http://pudolajuji.atwebpages.com/6437689876.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_off0000d67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67A 5508 bytes
SHA-256: 45fbdddeceab662d5e6cf4ea9964261ca74d132bc1a05bf78f34c7a6e5ffc159
font_01_sfnt_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 10740 bytes
SHA-256: 326148308989163300a86c8faa06b2612578448ffb2de741de52fb99808724bc

Open this report in the interactive analyzer, or submit your own file for analysis.