Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65692a90c8fc7d1…

MALICIOUS

PDF

73.2 KB Created: 2021-04-07 23:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c31f24e475ede94cda0ac3c42fef3d0b SHA-1: bff540e2a41de968e16a54529213b7c7abd4d5d1 SHA-256: e65692a90c8fc7d12ac5de1ec2cf832010c09b9a3eda3ee70472bae3942d5ae3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains an external URI pointing to 'https://maypoin.ru/wix?keyword=groups+with+funds+roblox', suggesting a phishing or malware distribution lure. The PDF also contains a large number of external links, indicating a potential link farm for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/wix?keyword=groups+with+funds+roblox PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475564/normal_5fd67c6dd910f.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/ie1qhg8/amazon_echo_dot_deals_black_friday.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380867/normal_5fe30a4c87b82.pdfIn PDF document text
    • https://cdn.sqhk.co/mifijizudi/jifHT1Q/starlight_west_grove_cinemas_garden_grove_ca_92845.pdfIn PDF document text
    • https://nutagabe.weebly.com/uploads/1/3/5/3/135325028/watubukoziz.pdfIn PDF document text
    • http://rigewojugofalas.iblogger.org/2015_amc_10a_solutions.pdfIn PDF document text
    • https://tugunopoxakisif.weebly.com/uploads/1/3/1/3/131398472/xikegufudi-dinesu-folepasikigiz-somuwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_8e916d637078461cb52cda5cc5c1132f.pdf?index=trueIn PDF document text
    • http://pibusobi.epizy.com/larousse_english_spanish_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/bigeninujusuwukubawakigu.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/32148955144.pdfIn PDF document text
    • https://71bfc0c6-4bef-405a-aee6-9e9dcaab3d12.filesusr.com/ugd/708cfd_4314e0737b614fa38f58a95b1db56873.pdf?index=trueIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_e27b0d233bec4ef0b96b31eb7d12c1dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/applied_multivariate_statistical_analysis_johnson_wichern.pdfIn PDF document text
    • http://gajoruza.epizy.com/bosch_ra1181_benchtop_router_table_best_price.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/beginner_ukulele_songs_youtube.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_ba6309ed970541458165e42e914309e4.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE192 5252 bytes
SHA-256: 1d33ffff59866f3f04a0c913a91f59bed966384bbfd0e97f6b34a4c0dd49afbf
font_01_sfnt_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 10756 bytes
SHA-256: 6e156e4e5d0159badc54210a47ea0a55636642440e950dca5c31115ebd7ca4ff

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