Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2dbf0176053c0b0…

MALICIOUS

PDF

73.1 KB Created: 2021-05-28 05:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 635ec3df9dd9bd0526db495f2164fc4d SHA-1: d48a6537432a63fcc2f9f3b0b0fbff04c09c645c SHA-256: b2dbf0176053c0b0de42d950f99e36b871ef1b0ee1b3acef688a230f76f62d2f
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://pelibifir.ru/123?utm_term=profecia+celestina+pdf+livro
    • https://cdn-cms.f-static.net/uploads/4454429/normal_60586114ca3c7.pdf
    • https://cdn-cms.f-static.net/uploads/4365541/normal_601d0698330e2.pdf
    • https://cdn-cms.f-static.net/uploads/4499329/normal_6068c777ae6c3.pdf
    • https://pifavakibapel.weebly.com/uploads/1/3/0/8/130814246/77684fa03.pdf
    • https://cdn-cms.f-static.net/uploads/4490539/normal_605215a747737.pdf
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/gakazasisoxaxow-binamurugobajo-remesusaverok.pdf
    • https://paxesejok.weebly.com/uploads/1/3/4/3/134348383/rojafanijuseretuw.pdf
    • https://palegovod.weebly.com/uploads/1/3/1/0/131070329/luzuzikojobod.pdf
    • https://bujupejokoluga.weebly.com/uploads/1/3/4/5/134576849/3020353.pdf
    • https://cdn-cms.f-static.net/uploads/4498983/normal_6039b54b1f7dc.pdf
    • https://cdn-cms.f-static.net/uploads/4374376/normal_6052be11ead02.pdf
    • https://static.s123-cdn-static.com/uploads/4475985/normal_5fce7b0b33bc4.pdf
    • https://cdn-cms.f-static.net/uploads/4374189/normal_60632ee5244ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a0f1081f-c558-46fa-bed0-8d4c81ffa3d0/63008951768.pdf
    • https://uploads.strikinglycdn.com/files/cc2b5492-6acf-4dff-8c83-fe599b65113e/bowetakogisuros.pdf
    • https://uploads.strikinglycdn.com/files/5a7ae44f-ca2f-406d-85f9-63492e13ddbc/xitazabikiz.pdf
    • https://uploads.strikinglycdn.com/files/49d98f85-2e6a-415f-a1f6-da731e0b1487/why_my_onn_bluetooth_is_not_connecting.pdf
    • https://uploads.strikinglycdn.com/files/e99fbf9c-192f-4b5c-804e-f2c5e232a270/how_to_fix_ge_microwave_door_handle.pdf
    • https://uploads.strikinglycdn.com/files/7d2f5788-0f1a-499f-b144-54e6efb2bf2d/how_to_create_a_reference_guide_in_word.pdf
    • https://uploads.strikinglycdn.com/files/deb5f82f-339d-4f35-b3e7-bbadc2addd09/mebobadegunodafulozawijat.pdf
    • https://uploads.strikinglycdn.com/files/0ed23731-a9dd-4d5d-b61b-cce6c2fce104/lavuvofukew.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_off0000dcb6.bin
ccad4e8b8e8a51bdb63221d5d93c1d48b71660c06be8bb9b6c53f0a4fe5a203e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB6 5208 bytes
font_01_sfnt_off0000ee84.bin
6b71a91559ad92b141d4b682c0b2fea0bb27cab97827557bfbf792aeb5a69e79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 12752 bytes

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