Malicious PDF — malware analysis report

Static analysis result for SHA-256 f950d2f8a9eb537b…

MALICIOUS

PDF

84.7 KB Created: 2021-03-24 14:38:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d81a74bfb956a5230bcecbcf739721ae SHA-1: b0b97db18b9c034a0e68ed662043fe344f152f8a SHA-256: f950d2f8a9eb537b5cdc017245b0cb0c25cbe58640aa6ddf55eb2e34d4201066
96 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier as malicious. It contains a large number of external links, with one prominent URL being `https://resalured.ru/wix?keyword=forro+dance+near+me`. The heuristic `PDF_SEO_LINK_FARM` indicates the presence of numerous PDF links, suggesting a tactic to manipulate search engine results or redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/wix?keyword=forro+dance+near+me
    • https://static.s123-cdn-static.com/uploads/4495837/normal_5fe1edfbea4c9.pdf
    • http://fesadivu.iblogger.org/94886540379.pdf
    • https://cdn-cms.f-static.net/uploads/4469355/normal_6027df34ac23f.pdf
    • https://static.s123-cdn-static.com/uploads/4485807/normal_5fdef1cb7ac6f.pdf
    • http://julidixove.22web.org/bivalvia_mollusca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_ddcc5f7630124ae3893564f94254836c.pdf?index=true
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_e3ff26249f9b4fabb599ebfc4c3b91c6.pdf?index=true
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_bb5c9a340bdc4f58862b7da79a8ba93e.pdf?index=true
    • https://19eae752-0dc2-40b2-988a-3ead9c543f91.filesusr.com/ugd/dee0a8_f016ffa3338a4bdca511eb6e0ca55d93.pdf?index=true
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_172a6d131af74530a91578839b624e48.pdf?index=true
    • http://kosinatatit.rf.gd/nevosikewilirumala.pdf
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_299b00ca563640089495f18c81a7a66a.pdf?index=true
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_dce05c172a994acc8ea75a5619cf4cdf.pdf?index=true
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_bac1814f320b422d82c779847f25f4e2.pdf?index=true
    • http://lixaxezubor.rf.gd/pijolusis.pdf
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_f41f011458d14740b73182d3e2593fb0.pdf?index=true
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_2341b99e56a64727b0597c61a093550f.pdf?index=true
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_b8a3cee6b37a495eb4b999025d34429e.pdf?index=true
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_065f1d931ce24bcf8bc73e6595064925.pdf?index=true
    • https://c2963e02-5f2a-49ff-bb4d-22715b80ab3a.filesusr.com/ugd/55efe4_0fbde128169f4dc1b6007eba6f412797.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_off0000fd19.bin
25b5eb04353175c7fb85535d83498a7560b301a771000f17a34dbb9f2b882175		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD19 4488 bytes
font_01_sfnt_off00010c2b.bin
67ad3f064736f965a8c4cd41b7d49262828000850f94d0c82c9ded2e8218799d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2B 13272 bytes
font_02_sfnt_off00013764.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13764 4324 bytes

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