Malicious PDF — malware analysis report

Static analysis result for SHA-256 5266b26d2eb4699e…

MALICIOUS

PDF

75.3 KB Created: 2021-01-09 22:53:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a6dfcc4185e1cc62edc6719477f3da4f SHA-1: c9691e467eacc7ebb50dbbbf6dcd27be93b64c07 SHA-256: 5266b26d2eb4699e83413ec96f541b62af067b0c0a0cf52677f36bc4b901a84d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggests the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or content-farming attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffset.ru/123?utm_term=kinematics+problems+worksheet+with+answers PDF link annotation
    • https://nilesezijifata.weebly.com/uploads/1/3/4/8/134885493/6140593.pdfIn PDF document text
    • https://mobefoba.weebly.com/uploads/1/3/0/7/130776725/5e4cdbc.pdfIn PDF document text
    • https://site-1199272.mozfiles.com/files/1199272/amc_cookware_price_list_usa.pdfIn PDF document text
    • https://site-1168354.mozfiles.com/files/1168354/90725653936.pdfIn PDF document text
    • https://govepemifowen.weebly.com/uploads/1/3/4/3/134372812/30df6e064a4.pdfIn PDF document text
    • https://site-1183169.mozfiles.com/files/1183169/7762323793.pdfIn PDF document text
    • https://site-1167963.mozfiles.com/files/1167963/gufosugerorotozavi.pdfIn PDF document text
    • https://site-1171796.mozfiles.com/files/1171796/note_taking_app_for_ipad_mini_2.pdfIn PDF document text
    • https://site-1174085.mozfiles.com/files/1174085/puvovepiwitalanepoxefo.pdfIn PDF document text
    • https://goponubinolofuv.weebly.com/uploads/1/3/4/6/134695307/3421b52157476a5.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/selivuvumepaveb/jumonarakedo.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/67170698202.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/binomische_formeln_bungen_klasse_9.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/abituriyent_2019.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_off0000e6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AB 5436 bytes
SHA-256: da5b227d6135c32a512f9a5beb06cd1aa60203bf08c8894dd0317711189543c5
font_01_sfnt_off0000f904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF904 11616 bytes
SHA-256: d033a3d53d1f688ee13cf2a2fdf85abd317a7f4623e66b6fb89c2d5c8ea6aee3

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