Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a10d1670f32c515…

MALICIOUS

PDF

80.0 KB Created: 2021-03-22 08:30:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 055679dca2d6dbfb42b0c87d3ecd5686 SHA-1: 9e283860cd09411852a7aa5c45fffe3f0ed56a89 SHA-256: 0a10d1670f32c515dbd85975cb9476a7f372e4c620017417a279a51f95984516
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of external links pointing to other PDFs hosted on disposable domains, indicating a link farm likely used for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs and the nature of the link farm point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://seumenha.ru/award?keyword=arches+national+park+map+pdf PDF link annotation
    • https://cdn.sqhk.co/fapulatonupe/hhA6hbO/oh_butterfly_song_free_masstamilan.pdfIn PDF document text
    • https://cdn.sqhk.co/vutazekerubu/4gg1cic/paint_by_numbers_kits_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/nejibija/EjfuOX8/christmas_wonderland_9_hidden_object_game.pdfIn PDF document text
    • http://maska-respirator.shop/psat_raw_score_conversion_chart_2018529p6.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/dv9gcSx/nedupudirod.pdfIn PDF document text
    • http://gratoramaa.space/210294013611ok44.pdfIn PDF document text
    • https://bipasakugerada.weebly.com/uploads/1/3/4/3/134350286/21c8c11e0.pdfIn PDF document text
    • https://cdn.sqhk.co/gogerazina/WAij485/jorezipa.pdfIn PDF document text
    • https://dirotazu.weebly.com/uploads/1/3/1/0/131070105/jenogujon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381529/normal_5fee7e83eca0b.pdfIn PDF document text
    • https://gukulijavezo.weebly.com/uploads/1/3/4/7/134714581/311ab58.pdfIn PDF document text
    • https://cdn.sqhk.co/batijuretak/je8vTge/21291377295.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/iif12f1/56067728751.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470400/normal_6011c1fd8ff60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401518/normal_6018684e9f655.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367951/normal_5ff663d4847c2.pdfIn PDF document text
    • https://mewifukemi.weebly.com/uploads/1/3/4/7/134764424/guput.pdfIn PDF document text
    • https://cdn.sqhk.co/zatuwifezub/W8Zcfhj/pinball_heroes_complete_vita.pdfIn PDF document text
    • https://cdn.sqhk.co/nigudovowa/iehhYgj/religion_popular_in_china_thailand_and_japan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_1b3d3850d6404216821ea7c9e58ebd85.pdf?index=trueIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_2e1cfd4214cc4e08917d4073bcf1bd55.pdf?index=trueIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_5e94f93135424ce8aa41b2b07507bb9f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 5236 bytes
SHA-256: c6641b114af4ef8487d53fdc2d2de6283aa0c1ccfbec1fa743558dbc88ec2a06
font_01_sfnt_off000101c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C0 10196 bytes
SHA-256: 4c8c08876cdca1a88e8b400b4c64b7891d858e1ec4fa640ddf6386222bb99360
font_02_sfnt_off00012496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12496 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f