Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35ebe995e324055…

MALICIOUS

PDF

86.3 KB Created: 2021-06-09 14:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b1d727641a194066656665a8b99b7d1e SHA-1: 16a021ea9e27cf77709a0db6ea53dc5df919df90 SHA-256: e35ebe995e32405531a7e0a45929477ea184793debece465a7dd9674822bf63e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://queure.ru/pbw?utm_term=bigo+live+free+diamonds+no+human+verification PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407306/normal_5fe0977de2697.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375351/normal_5fe3f6cb3a6ce.pdfIn PDF document text
    • https://wexixumativedo.weebly.com/uploads/1/3/4/8/134865676/c8e6f606998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460231/normal_5fea14307b7e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369631/normal_5fd716127958b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417413/normal_60be6ca07a8d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460465/normal_5ff84b6cbc98d.pdfIn PDF document text
    • https://jizojalagakamu.weebly.com/uploads/1/3/4/8/134886497/9ac29e63a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490516/normal_5fd36e9271ab0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378623/normal_600a0e2f40af2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481699/normal_606d23f6b30ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404515/normal_60009b8b41c5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493610/normal_5ff7a6d56d0d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424647/normal_601145a7499e6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144415620/48180074782.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/penny_stocks_to_buy_robinhood_reddit.pdfIn PDF document text
    • http://jowukon.pbworks.com/f/how_to_make_a_aether_portal_in_minecraft_pe.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/how_do_i_update_my_autel.pdfIn PDF document text
    • http://kigiputilik.pbworks.com/f/55986519157.pdfIn PDF document text
    • http://zigunef.pbworks.com/f/57350347393.pdfIn PDF document text
    • http://beratirupo.pbworks.com/w/file/fetch/144601236/how_to_change_talking_watch_time.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
    • 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_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 5544 bytes
SHA-256: 2f0b777162ee0754c74bbdd577812a39e7b89c9e7cc1666fbebe219ec0a9a75b
font_01_sfnt_off000102c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C1 2076 bytes
SHA-256: 916a854634cde66e1a4246342f976df2e600844b82d0187cb93c95853b8f89ed
font_02_sfnt_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 12172 bytes
SHA-256: d58514e57932544963aa31f800c01fe7ce7f463b27c49e2181f11ddd87c0738e
font_03_sfnt_off00013371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13371 16344 bytes
SHA-256: 3745d395dffe053ce12bb6e6d543a89fda750690c61e1e786fb35984b58e44e5