Malicious PDF — malware analysis report

Static analysis result for SHA-256 a882c61f6c99725e…

MALICIOUS

PDF

76.1 KB Created: 2021-04-15 14:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a817be42cab1a4a47ab2391d37d0ddc4 SHA-1: d00089dcb4b41eba2cf35610758afb8291a0ece1 SHA-256: a882c61f6c99725e677f9b65b8534f75eaaef3e9aa816a48c081aa9c1b3da766
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' confirm the document's purpose is to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://soxebez.ru/strik?utm_term=geometric+figures+formulas+surface+area PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443608/normal_603854f5c8a5b.pdfIn PDF document text
    • http://macsk.space/kaminirigisegimepy2ox.pdfIn PDF document text
    • https://nusesosof.weebly.com/uploads/1/3/5/2/135296084/wazigug-fuzemezami.pdfIn PDF document text
    • http://blekrossi.ru/kinoxifikedidanovupif7rtq6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367013/normal_600a035313db2.pdfIn PDF document text
    • http://lami-lashes.site/475653976016yy0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386089/normal_603f86921d397.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372377/normal_602cf3a8024e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471514/normal_601888c428cd3.pdfIn PDF document text
    • https://depopuxa.weebly.com/uploads/1/3/4/8/134893869/5616919.pdfIn PDF document text
    • http://justamorem.com/how_many_languages_are_spoken_in_nepalhlnvi.pdfIn PDF document text
    • https://tuvomirunasoz.weebly.com/uploads/1/3/4/3/134324776/7900276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420934/normal_6069167f6e668.pdfIn PDF document text
    • http://reetodo.online/osha_cfr_29_part_1926_2016x8l25.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_9ecfadc7bb694d75b5936e89d3149ed6.pdf?index=trueIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_3ac82883de894643b82e1273356011da.pdf?index=trueIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_2f2b70e3255041efa6045e52617f6038.pdf?index=trueIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_873114eb3bcf4ca984ac11daea4a7f6f.pdf?index=trueIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_d8bd86c5119c4e87b8bf0d61d5bddc34.pdf?index=trueIn PDF document text
    • https://f856bbc4-01c8-45e4-8891-a53c5ee59fd0.filesusr.com/ugd/8e827e_f061ad1f111a4c618bb230974951fb1f.pdf?index=trueIn PDF document text
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_32f7c8d0c1c345fcaa462217787fd069.pdf?index=trueIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_6f9195d774e34bccb65e541a580044f8.pdf?index=trueIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_322479c3d273441c96013e3dcac837ec.pdf?index=trueIn PDF document text
    • https://0ffdd24b-620b-4f4d-94ef-a39da1ca20bd.filesusr.com/ugd/853ce2_545c42fb972347d3b10f695356dcdedf.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_off0000e9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E4 5232 bytes
SHA-256: 2356680197e75b74ca59f2e744437035dc22a1bc01464f18ae654a74b0eb6a6a
font_01_sfnt_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 11288 bytes
SHA-256: 5ba98d2e8abdbc9d499423e911ca0deb30e8f29d18b31804ac1a68182a969f18

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