Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd160b84216e168…

MALICIOUS

PDF

76.2 KB Created: 2021-03-17 14:05:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d89da208b98e4267698d2ea7e8b073b8 SHA-1: a92853fb12587181b2739bf1074cf59afc8d2ef7 SHA-256: 7fd160b84216e168bc983d4add641f0226832a8ae4c9283f516ff746a8c1e6fc
214 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a malicious redirector pointing to 'https://yafferge.ru/strik?utm_term=dan+brown+inferno+sinopsis'. The file also exhibits characteristics of a PDF link farm, containing numerous external PDF links, one of which is 'https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_5502f209ea154c8995a7466c63b86806.pdf?index=true'. These findings, combined with ML and ClamAV detections, strongly indicate a malicious phishing or content manipulation campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=dan+brown+inferno+sinopsis In PDF document text
    • http://lasiwefomibew.sportsontheweb.net/80730079746.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/wjddoge/62286207187.pdfIn PDF document text
    • https://cdn.sqhk.co/lowanivari/jfU6yhj/xerovorokivafaj.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/4hihgYo/sigoveneke.pdfIn PDF document text
    • http://pojapusevipuzu.mypressonline.com/jnvst_admission_form_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/jivobukafon/ibiiYgh/jilalumubujufebodunabiwo.pdfIn PDF document text
    • http://ganitigusawev.mygamesonline.org/mizalubajegaxajamif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_5502f209ea154c8995a7466c63b86806.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bidivo/what_goes_with_shredded_pork.pdfIn PDF document text
    • http://labiwuju.rf.gd/captain_america_comics.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/zodokepisobuwurefarasab.pdfIn PDF document text
    • http://lojuwuwa.rf.gd/40723738075.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/4480179177.pdfIn PDF document text
    • http://pudawetik.rf.gd/48489060254.pdfIn PDF document text
    • http://jovawat.epizy.com/angel_vandhale_hd_video_song.pdfIn PDF document text
    • http://bubewap.rf.gd/69478624509.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/fifipa.pdfIn PDF document text
    • http://nenilezum.epizy.com/puzufovatameg.pdfIn PDF document text
    • https://c3bb11cb-ba02-405d-8462-2b4421b436e1.filesusr.com/ugd/4c7814_bfa2287b294f40d093ff4f7b92856776.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/zenimaxenamol.pdfIn PDF document text
    • http://vixabewe.rf.gd/baofeng_bf-uv5r_review.pdfIn PDF document text
    • http://fajanelumaj.epizy.com/korean_dictionary_app_free.pdfIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_982a3268a065455a895058d40ff13dce.pdf?index=trueIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_c476af3e3bde4592bef9ef0af089adf3.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_off0000eacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACD 5092 bytes
SHA-256: 6dd612cd8cad7399e7bf4e81df43e99a0e50cd54f693040dd5fb488e9ec7cb55
font_01_sfnt_off0000fc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC47 12152 bytes
SHA-256: a5a3c3722d250c80ccf21bac240791128cc17433346893a4eb13f6d5d56b26fb

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