Malicious PDF — malware analysis report

Static analysis result for SHA-256 38aa4704e0944b44…

MALICIOUS

PDF

71.7 KB Created: 2021-06-04 04:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6cedfe459184b569546599ae6146ede SHA-1: 75803ecc496d3375970d54c45bd17f8fcb6edad7 SHA-256: 38aa4704e0944b4434e97565cee7206087b7b6165d2a7b9c09b785ec2ce7c660
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to link farms, suggesting a phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://queure.ru/pbw?utm_term=how+do+you+use+the+liturgy+of+the+hours
    • https://mexupapomumag.weebly.com/uploads/1/3/0/7/130775103/5129935.pdf
    • https://vifawadezak.weebly.com/uploads/1/3/4/8/134846548/vupix.pdf
    • https://jifemeput.weebly.com/uploads/1/3/4/3/134398411/ruwizuj.pdf
    • https://static.s123-cdn-static.com/uploads/4489599/normal_5fc9a2f061447.pdf
    • https://wosexepipoto.weebly.com/uploads/1/3/5/3/135347387/8529096.pdf
    • https://zedalikekotax.weebly.com/uploads/1/3/1/1/131163955/4123342.pdf
    • https://static.s123-cdn-static.com/uploads/4425760/normal_600832a75285d.pdf
    • https://vatenesarawe.weebly.com/uploads/1/3/0/7/130775606/nibedamoji.pdf
    • https://doxujivadew.weebly.com/uploads/1/3/4/8/134875716/2803109.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://najajadux.pbworks.com/w/file/fetch/144585858/21691379129.pdf
    • https://uploads.strikinglycdn.com/files/2718e1e0-3886-4fc2-b9ca-3050f8090d78/pukelakojo.pdf
    • https://uploads.strikinglycdn.com/files/1205f0d2-de83-41b8-8e0b-2c119cb3e756/oracle_database_19c_support_end_date.pdf
    • http://vawijoj.pbworks.com/w/file/fetch/144447567/bartaman_bengali_newspaper_download.pdf
    • https://uploads.strikinglycdn.com/files/6150abb6-ece8-4bf0-8baa-ac87aaf50111/agricola_rulebook.pdf
    • https://uploads.strikinglycdn.com/files/0272ea02-e6ca-4940-b64b-8d692db5be9a/novum_organum_significance.pdf
    • http://vawaguzidatu.pbworks.com/f/vokakazuku.pdf
    • https://uploads.strikinglycdn.com/files/8fb51a53-bdaa-41e8-a387-f50d49078126/3992219585.pdf
    • https://uploads.strikinglycdn.com/files/d7d6afc3-e2ca-478b-a85e-64a9dd24d7eb/94380462725.pdf
    • http://mizunebapod.pbworks.com/w/file/fetch/144583548/how_to_set_up_personal_hotspot_on_verizon_account.pdf
    • http://lulatigono.pbworks.com/f/40839629905.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da06.bin
1e1f63e04f6005ef345f52a8035ec414115de7ae66fcc013f360703ca7134227		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA06 5112 bytes
font_01_sfnt_off0000eb7f.bin
1d3ef192112be7beb8da40443c6b5651c6ecc1d164ade4256d9b8c3da304e813		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7F 10632 bytes

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