Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87c6f519b5c5f02…

MALICIOUS

PDF

73.2 KB Created: 2021-04-29 19:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf7f35de371ae519229d82665fc2b1e1 SHA-1: 994f3ccb62f913702f72ab45d046e20ea4458a66 SHA-256: a87c6f519b5c5f0213bbd1e8589beba6f09c12df533bc802b6dd5f85c01235a9
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with the primary malicious URL being https://pelibifir.ru/strik. The document body, though heavily obfuscated, contains text related to financial figures ('how much a day is 6 figures'), suggesting a phishing or scam lure. The presence of numerous external links and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=how+much+a+day+is+6+figures
    • http://vogolimipogusoz.mypressonline.com/ac_dc_back_in_black_guitar_tab.pdf
    • https://wutotopuwa.weebly.com/uploads/1/3/4/4/134464713/zegosalo-mutezulu.pdf
    • https://fugikoji.weebly.com/uploads/1/3/4/6/134611078/sufoxutokoze.pdf
    • https://zedawaven.weebly.com/uploads/1/3/4/6/134634651/9e63bf27e38e.pdf
    • https://xatuzagu.weebly.com/uploads/1/3/0/7/130738971/wewimuwu-dexosa-nofudimu-siduzog.pdf
    • http://kodepovorivapi.mygamesonline.org/wamajevunudidi.pdf
    • https://vigijamavo.weebly.com/uploads/1/3/0/9/130968937/a2378f7517e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_d832cf5edc62481d93d6e7def433e7ec.pdf?index=true
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_f52a0e06367e43a7af138d05a078394c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8cb807a3-3abe-4b2d-ab6c-ebcfe968465c/how_to_develop_childrens_learning_skills.pdf
    • https://uploads.strikinglycdn.com/files/098d24d1-20f6-4676-9def-36d1482b378f/how_to_operate_a_hoover_steamvac.pdf
    • https://uploads.strikinglycdn.com/files/ab81d5a8-43e8-4d7f-baa3-9b21af1b516a/dexerasusakimivajonap.pdf
    • https://a8a57b57-a5e9-4b5c-b824-02731ce3a1bd.filesusr.com/ugd/cfa667_5f57b22387324f86b0414b4a0861d54c.pdf?index=true
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_7742f9e3e8b84188aab4052ca2f7a6df.pdf?index=true
    • https://a529afa0-707c-494d-9cee-e9df2360aa12.filesusr.com/ugd/a6e48a_fec8f88c34d14752bcd037fb0092addb.pdf?index=true
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_4091e64928b54aaeb97c7e34745aab2b.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddfd.bin
fa7222fd16f53e59cf688b10b029569e4d78ab37334dd9663efe7ade325436b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 5712 bytes
font_01_sfnt_off0000f165.bin
ce90ff2a552324676156a4db9a956c5f69e5d4ccf99acfc365a26793fa0da6fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF165 11268 bytes

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