Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fdb3ea6973f15a1…

MALICIOUS

PDF

135.5 KB Created: 2021-03-30 10:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: daabc0d9ca93af1a33ea47ca3550b2b8 SHA-1: 803d3aec824c60d1f3f1626b9f96dd7587a498c6 SHA-256: 2fdb3ea6973f15a1f991a879517661d17f6feac30401fe64d07d8e8463365583
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. The file contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm. One of the primary links, 'https://seumenha.ru/strik?utm_term=casio+module+5302+battery', appears to be a lure for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=casio+module+5302+battery PDF link annotation
    • https://fojaxekixuwid.weebly.com/uploads/1/3/4/7/134743661/rilusem.pdfIn PDF document text
    • http://cg-designer.xyz/58114988589iiub3.pdfIn PDF document text
    • http://mufobej.iblogger.org/8750412380.pdfIn PDF document text
    • https://linekepev.weebly.com/uploads/1/3/4/0/134041162/jenixo-metodalamuz-weverawe-bizumepabulu.pdfIn PDF document text
    • http://psychologyrelax.xyz/talking_tom_cat_2_download_apkpurez2nea.pdfIn PDF document text
    • http://zelolugo.22web.org/hack_wifi_wpa2_android_no_root.pdfIn PDF document text
    • http://comp-arenda.site/how_does_final_draft_work7w870.pdfIn PDF document text
    • http://bitjoms.xyz/25700041297pjnac.pdfIn PDF document text
    • https://wagidojinubem.weebly.com/uploads/1/3/1/4/131438567/1e492c98ae18.pdfIn PDF document text
    • https://vimadefivikimaw.weebly.com/uploads/1/3/4/2/134265378/9b160615e.pdfIn PDF document text
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/1486311bad1f22d.pdfIn PDF document text
    • http://mmmmmme.space/90772316511wv6al.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_8c549fa118894d41a23efd5d3734c9e5.pdf?index=trueIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_f10329e754fa4ef4bedcf8530226df96.pdf?index=trueIn PDF document text
    • https://9c33b4df-6f14-41ad-9e94-a3a23f7ed20d.filesusr.com/ugd/2a975f_9810aecc966c4cc9bd179217dc3af6ab.pdf?index=trueIn PDF document text
    • http://sidafagunajud.epizy.com/dry_augusten_burroughs_download.pdfIn PDF document text
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_08ad4ab6f3a04dbd91e2238deb1b239e.pdf?index=trueIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_40f71a2f8f724cf4815bd48596ffab8c.pdf?index=trueIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_93ae10af9e214eddb88f441aedd38cd2.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD096 81192 bytes
SHA-256: e71dc5398e969561079c650bbea9d1d7576d4a6d6d7cbbbc188aba660d5ae15c
font_01_sfnt_off0001c3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3E4 5680 bytes
SHA-256: 2b2e862df12679936d3d3d04e7d085235547b2fdb0a7fa51aea73fca4f98aac2
font_02_sfnt_off0001d718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D718 9596 bytes
SHA-256: 7254d1eb020081d584bc47ab8a053f97075406fb25ffc45ad14b91785e4b9900
font_03_sfnt_off0001f831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F831 16160 bytes
SHA-256: b91ebbfc40a94f10b2fcfc4d08542e4cd4fc38dcff43bcfefe5d572695fcce17