Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba71f5f2a25b312c…

MALICIOUS

PDF

74.8 KB Created: 2021-03-12 21:42:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bee0baa480c8e5e90e724f2f13415700 SHA-1: b02354847a27c781d7b4033475bc2186b70c2246 SHA-256: ba71f5f2a25b312ce97752b2a4e03fbe3a502999d91bec2fece90fb53e6d514d
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 hosted on disposable domains, indicating a link farm or SEO spamming operation. ClamAV and ML classifiers identified the PDF as malicious, specifically a phishing trojan. The embedded URLs, such as 'https://botokaw.ru/wix?keyword=precalculus+book+mcgraw+hill+pdf', suggest a lure to trick users into searching for specific content, likely leading to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/wix?keyword=precalculus+book+mcgraw+hill+pdf PDF link annotation
    • https://labifunuvi.weebly.com/uploads/1/3/4/8/134847398/8677435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446170/normal_6028390b3b0fc.pdfIn PDF document text
    • https://wajabanafeku.weebly.com/uploads/1/3/4/5/134599300/dazelajimofi.pdfIn PDF document text
    • http://legionmone.xyz/oe8jc.pdfIn PDF document text
    • https://sefomaxezaniv.weebly.com/uploads/1/3/1/4/131483109/fagipumosa.pdfIn PDF document text
    • https://fotelixufigowex.weebly.com/uploads/1/3/1/0/131071188/5e46f6cd93ee2e7.pdfIn PDF document text
    • https://dapasubasawesol.weebly.com/uploads/1/3/4/3/134383907/4090484.pdfIn PDF document text
    • http://zubiki.top/polk_magnifi_mini_manuall91n9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482848/normal_5ff4ff581ca11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425501/normal_5fc875b928b78.pdfIn PDF document text
    • https://miduginoxem.weebly.com/uploads/1/3/4/8/134892771/f2590392bcadfb.pdfIn PDF document text
    • http://richmaya.site/infatuation_nyc_guides02t9r.pdfIn PDF document text
    • https://wovovude.weebly.com/uploads/1/3/1/3/131397940/6143336.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_046b5f94a95f4604ae64b9024646d439.pdf?index=trueIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_2cd4b91682bc42d7bb5210d2967bec0e.pdf?index=trueIn PDF document text
    • https://9d3edb37-11ce-4d87-b861-4f8d850d55a0.filesusr.com/ugd/0d2aa0_77b9aaea297348cf96a2ecaab1e492b2.pdf?index=trueIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_0f47b42a5d98484780c77271a87811b6.pdf?index=trueIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_3e4009df9d044d03ad64f8fec72909c5.pdf?index=trueIn PDF document text
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_dc1dac0491924043bf4a5aa6db483e0c.pdf?index=trueIn PDF document text
    • https://19527f6f-7821-4b33-8e58-d909ab9a203f.filesusr.com/ugd/b18fc6_3e119f6404024936a656bdc195c0979d.pdf?index=trueIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_c8f5abb9d73b46a8a03a628a9b7ffd81.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_off0000e6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 5868 bytes
SHA-256: 97fa545976ac3cf35e8d42dc486633bb98a911f85a9dde8eb4ad3ed1f630c8ec
font_01_sfnt_off0000faae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAE 10228 bytes
SHA-256: 3b6793f34059d42d961bd0a27a266941a9c63a3263bd3d950de3dd060d855f10