Malicious PDF — malware analysis report

Static analysis result for SHA-256 8230049394f4aaab…

MALICIOUS

PDF

70.0 KB Created: 2021-03-31 07:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4dc4ac37b44d16ec5edf9e829f1a9bcd SHA-1: 07c88640655c76952339c357c68414ae79edb2e8 SHA-256: 8230049394f4aaabd3f532848e6416d07181cde458905aa035b2d2b01de9f195
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that point to other PDF files, suggesting a potential distribution or SEO manipulation scheme. The presence of many external links on potentially disposable hosting further supports a malicious purpose.

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
  • 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://bologen.ru/award?keyword=cessna+414a+maintenance+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383579/normal_604d3403ce283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453118/normal_602873c12c2c0.pdfIn PDF document text
    • http://detonic-buy.website/vidmate_apk_mirror_version_2._27r44dp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420438/normal_6048a4f9dbeb5.pdfIn PDF document text
    • https://senamevab.weebly.com/uploads/1/3/4/6/134689233/3787065.pdfIn PDF document text
    • http://tohld.in/160184098482cmh0.pdfIn PDF document text
    • http://moitender.org/bsa_red_dot_scope_battery_sizepexi5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409997/normal_60201199c03f0.pdfIn PDF document text
    • http://avit0.cc/how_much_is_steve_jobs_net_worth35fip.pdfIn PDF document text
    • https://kimimidinom.weebly.com/uploads/1/3/1/4/131453749/bigilak_xudovazove_liluxiza_denudomotex.pdfIn PDF document text
    • https://lefiletigej.weebly.com/uploads/1/3/4/5/134597596/78759b.pdfIn PDF document text
    • http://napowojeba.medianewsonline.com/cachaza_de_caa_de_azucar.pdfIn PDF document text
    • http://aov.one/vilurupesibowutebuvxvpz.pdfIn PDF document text
    • https://xinusikavafomi.weebly.com/uploads/1/3/4/3/134353784/48263f7537beba9.pdfIn PDF document text
    • http://wufamega.scienceontheweb.net/27005130725.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fotizojorirepel.onlinewebshop.net/46807037986.pdfIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_efc4f2cbbe6a4c82860003187fd5b253.pdf?index=trueIn PDF document text
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_515904921d604b08bea7f94456c83908.pdf?index=trueIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_a53daffb61e24bc2830df34a9f8994f3.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_off0000d4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CF 5248 bytes
SHA-256: 1a7296ecc0d80def19936e5e79acbecd7785bd042d4349bbf2fddcb4401d8860
font_01_sfnt_off0000e6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A6 10064 bytes
SHA-256: 5e93b1eb0ab8751ecde7224592dce2491df58f92c6883945927452d2b765068c

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