Malicious PDF — malware analysis report

Static analysis result for SHA-256 d372ccb29211b44c…

MALICIOUS

PDF

84.3 KB Created: 2021-01-12 19:27:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cbd8c1d3dffa4524c90b8babe1f4f573 SHA-1: b4a581dd577c9d6786cf499a522c048a992175c6 SHA-256: d372ccb29211b44cad17bdbe2e78893db2799e5884c54ea65d9a2417ee9be504
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs pointing to disposable domains and link farms, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier also strongly flagged this PDF as malicious. The primary purpose appears to be directing traffic to these external sites, which could host further malicious content or phishing pages.

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.
  • 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://traffnew.ru/123?utm_term=80+meter+hurdles+measurements PDF link annotation
    • https://sererewaxux.weebly.com/uploads/1/3/4/9/134903335/pijulip.pdfIn PDF document text
    • https://site-1175198.mozfiles.com/files/1175198/kuvelipudoxototemog.pdfIn PDF document text
    • https://bixevojug.weebly.com/uploads/1/3/0/7/130739122/fb806350f9ec.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/1114918.pdfIn PDF document text
    • https://cdn.sqhk.co/lipetebo/fihaYhf/puvatejum.pdfIn PDF document text
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/570348.pdfIn PDF document text
    • https://cdn.sqhk.co/dopuwene/jcdheij/vevusodosuver.pdfIn PDF document text
    • https://namosupegu.weebly.com/uploads/1/3/4/3/134313644/6169343.pdfIn PDF document text
    • https://nojokuvevufig.weebly.com/uploads/1/3/4/1/134109253/duxawitekuwexeputa.pdfIn PDF document text
    • https://vifedunujaxali.weebly.com/uploads/1/3/4/3/134398483/6612939.pdfIn PDF document text
    • https://site-1178186.mozfiles.com/files/1178186/subway_princess_and_cat_runner_game.pdfIn PDF document text
    • https://laduvozonos.weebly.com/uploads/1/3/1/4/131408864/figujonotew.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f1d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF1D7 15216 bytes
SHA-256: 2d05978cebf0d3b6618b2a32d80102df1c410dd697bf37ba87752b99cb435ae0
font_00_sfnt_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 5308 bytes
SHA-256: 87a476a4461d1890f6fb78d4185a0f1a7e1a07e6b56285a6d12b889326a84539
font_02_sfnt_off00011c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3A 11648 bytes
SHA-256: ae45aed73ddb6ec581fa9a5354fa3f6a4c345cc0a4073cc402ee3dbaf9b58c0c

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