Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3e473bbbc9f5b4…

MALICIOUS

PDF

86.3 KB Created: 2021-03-28 21:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b75f7b42e4d1c315dab147d06348652 SHA-1: db6fe28fcfff89e20b520694e489d8bae68ee5ed SHA-256: fa3e473bbbc9f5b4e8beac45c9bb677bf384cbc04a3e2d0563ae24308be9bce5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting an attempt to manipulate search engine results or direct users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature. While no scripts were explicitly extracted, the presence of external URLs and the phishing/trojan detection strongly suggest a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=tonight+west+side+story+score+pdf
    • http://viwavidif.getenjoyment.net/wixakuta.pdf
    • https://static.s123-cdn-static.com/uploads/4460071/normal_5ffb5cfabea3b.pdf
    • https://cdn-cms.f-static.net/uploads/4383561/normal_601272656893e.pdf
    • https://cdn-cms.f-static.net/uploads/4453337/normal_603c4d20ecae6.pdf
    • http://bidetoluji.getenjoyment.net/26526835295.pdf
    • http://kidupat.getenjoyment.net/59152336695.pdf
    • https://cdn.sqhk.co/xikotoxerov/Fjbhhjb/reported_speech_affirmative_negative_sentences.pdf
    • https://cdn.sqhk.co/xotabuti/izWjdgT/stickman_fighter_3d_2018_mod_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4374021/normal_5fe441602824f.pdf
    • https://cdn-cms.f-static.net/uploads/4452865/normal_604d26d9020be.pdf
    • https://cdn.sqhk.co/kufomopinu/hTUZHHV/21176892797.pdf
    • https://cdn.sqhk.co/bifoligi/iK0bhgQ/mediamonkey_gold_full_download.pdf
    • http://ruluzuzadol.mypressonline.com/41014228518.pdf
    • http://dexaputanit.mygamesonline.org/where_was_the_miseducation_of_cameron_post_filmed.pdf
    • https://cdn-cms.f-static.net/uploads/4387811/normal_6055327d1be13.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8b7199fc-a029-4910-8138-caee300d1cbd.filesusr.com/ugd/da8f68_d43f76336d424d93bdbbce39939bf25e.pdf?index=true
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_a6fd9365d4034efdb4b3edc809aea788.pdf?index=true
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_afe6aba7f76040f58ff1bb93b5dd69ff.pdf?index=true
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_7af91b77d9d44aac95187b203b7989f6.pdf?index=true
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_c5b47925de6c4c8cae2f2d053c960d41.pdf?index=true
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_702c9a35c26d4cae83f0447180ee070a.pdf?index=true
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_a0910e6bf7874feaa93bc57a82e00712.pdf?index=true
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_0b3c15b1c2b34025a4d24c2d67795754.pdf?index=true
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_5e5378d74d85489f9690ad82e488d158.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e60e.bin
2752993a775614d221a661c058dad987b47b14656ed8364272baa1779dd85c49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60E 13268 bytes
font_01_sfnt_off000110df.bin
b5572638562a30d7e9a7d59b25730b17487a5e952dc86000211568039b8eb89a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110DF 5320 bytes
font_02_sfnt_off00012313.bin
c793dfbfc3a6b6c5ee3c5febbc363b3c5d495d0179ab64896910668631165418		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12313 11064 bytes

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