Malicious PDF — malware analysis report

Static analysis result for SHA-256 4273e2ae2b8babd4…

MALICIOUS

PDF

122.6 KB Created: 2021-01-14 00:56:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 939a13acd01e1a20c12b2e3be07aa50d SHA-1: 626f47a34580a468c82e1ecb1e16c47b9ef1b9e0 SHA-256: 4273e2ae2b8babd4d3f0124918de756c129cf7f708e931bf5030f397c6d786f2
222 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including linking to known malicious redirector infrastructure and containing a large number of external PDF links, suggesting a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs are likely used to redirect users to phishing sites or download further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cctraff.ru/123?utm_term=lowdermilk+maternity+nursing+11th+edition+pdf In PDF document text
    • https://vibufimibe.weebly.com/uploads/1/3/0/7/130738819/c6ea85.pdfIn PDF document text
    • https://site-1177846.mozfiles.com/files/1177846/dibasic_sodium_phosphate.pdfIn PDF document text
    • https://site-1239165.mozfiles.com/files/1239165/lagu_bilang_pada_tuhan_mu.pdfIn PDF document text
    • https://bogujodoj.weebly.com/uploads/1/3/4/8/134881838/6e84ad6396f09.pdfIn PDF document text
    • https://numetoximo.weebly.com/uploads/1/3/4/7/134717633/tegopi.pdfIn PDF document text
    • https://site-1174394.mozfiles.com/files/1174394/tank_destroyers_battle_of_the_bulge.pdfIn PDF document text
    • https://site-1171371.mozfiles.com/files/1171371/sosemesosuvedugerabudi.pdfIn PDF document text
    • https://fusagepewaliwe.weebly.com/uploads/1/3/5/3/135325652/nanixezepirigefex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/98904998264.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/94991914082.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/ge_dishwasher_gdf570ssfss_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/cleric_5e_domain_spells.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/78294466144.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3CD 5708 bytes
SHA-256: eb14dc1fba59687d4f035cecc4753a95216da4b9f363205cb15aae21c9343618
font_01_sfnt_off0001b738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B738 10948 bytes
SHA-256: 1c5f484c8880ac881e88b2004a8bcc5cd218d2125af6852e47dbae563b0c668b

Open this report in the interactive analyzer, or submit your own file for analysis.