Malicious PDF — malware analysis report

Static analysis result for SHA-256 76430d8b1bed674d…

MALICIOUS

PDF

85.0 KB Created: 2021-06-04 08:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c2a2b0a6e332804e2ff57b3385fa72a SHA-1: db170f2b9bb9f2fd4a6dcffa29e17b8338240d43 SHA-256: 76430d8b1bed674dc250c72812bbe15f6538407a774cd32864d3f5813224323a
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a significant number of external links, with a critical heuristic flagging it as a PDF link farm. The primary URL observed is 'https://golowaki.ru/123?utm_term=sample+questions+answerable+by+agree+or+disagree', and a notable secondary URL is 'https://tonibakak.weebly.com/uploads/1/3/5/3/135346506/vepogetavovatu.pdf'. The presence of embedded URLs and the link farm heuristic strongly suggest an attempt to direct users to potentially harmful external sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/123?utm_term=sample+questions+answerable+by+agree+or+disagree
    • https://tonibakak.weebly.com/uploads/1/3/5/3/135346506/vepogetavovatu.pdf
    • https://static.s123-cdn-static-d.com/uploads/4388052/normal_60b61f81e6dee.pdf
    • https://cdn-cms.f-static.net/uploads/4417818/normal_60668c47cd2d0.pdf
    • https://daliroxemonove.weebly.com/uploads/1/3/0/7/130775241/894067020c.pdf
    • https://cdn-cms.f-static.net/uploads/4386834/normal_60309340a658a.pdf
    • https://gedaxafi.weebly.com/uploads/1/3/4/3/134340736/5aa3e5eb2cdcbb.pdf
    • https://mapusuxila.weebly.com/uploads/1/3/7/5/137502154/gefidoxetobolab_zukil.pdf
    • https://static.s123-cdn-static.com/uploads/4473642/normal_6001919c3fa5c.pdf
    • https://newosupileseru.weebly.com/uploads/1/3/2/3/132303396/momonekataduf.pdf
    • https://pilumana.weebly.com/uploads/1/3/2/6/132683063/rujizobov-kifizema-pakubob.pdf
    • https://static.s123-cdn-static.com/uploads/4478927/normal_600118422c724.pdf
    • https://cdn-cms.f-static.net/uploads/4371787/normal_6046543346877.pdf
    • https://vesanawe.weebly.com/uploads/1/3/4/6/134602832/dosebugusugub.pdf
    • https://lopuradusat.weebly.com/uploads/1/3/5/2/135297354/6853a435d58d57f.pdf
    • https://pobowapikojuga.weebly.com/uploads/1/3/4/9/134903403/suwugaton_vuvekavajezo.pdf
    • https://static.s123-cdn-static.com/uploads/4408599/normal_5ffaaae2b032e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/838e8242-7ec2-4b6c-8671-1adaf58e51d0/17229133004.pdf
    • https://uploads.strikinglycdn.com/files/64afd2ac-0324-47dd-8cb6-30b453f32892/grossman_algebra_lineal_7ma_edicion_solucionario.pdf
    • https://uploads.strikinglycdn.com/files/956fbe53-5d02-4d9e-b8dd-e8789f6e3568/bach_cello_suite_1_in_g_major.pdf
    • https://uploads.strikinglycdn.com/files/55e27edc-a8c2-44c5-b972-1ba0b755649d/jufinegoribatapi.pdf
    • https://uploads.strikinglycdn.com/files/6f862135-4ec6-4933-bdbc-ab22e205cf2d/82551883294.pdf
    • https://uploads.strikinglycdn.com/files/84a84e7b-57e8-4e90-9fb1-1dd42315a8f0/61423162401.pdf
    • https://uploads.strikinglycdn.com/files/2a3f15fb-717e-4396-bdc3-f02466602b87/chuck_palahniuk_survivor_ending.pdf
    • https://uploads.strikinglycdn.com/files/f14ac782-9a09-4c4c-a945-2e82c9d35574/77293442304.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010de4.bin
51e9818fc4d662ce4801d0030022c5be90bdcde38a05cc8980e001e524918ba5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE4 5844 bytes
font_01_sfnt_off000121b2.bin
6f6a1c90c33b863502fb2f6b2b6ed8e826374ee3440dca8efa387fddb4040958		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121B2 10736 bytes

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