Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1748c9461bb67fe…

MALICIOUS

PDF

80.6 KB Created: 2021-05-12 08:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcd0dbdeb8e307a88e5d4a7d0aea9b7f SHA-1: 45015b3535726f288a82210273d18bed5c74ae1a SHA-256: f1748c9461bb67fe4ac5b64e5babcd956bd422afd5443d726418dfb2fd9722ac
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. The embedded URLs and the heuristic firings indicate an attempt to redirect users to external sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://xezojetit.ru/strik?utm_term=transport+phenomena+bird+solution+manual
    • https://vesixogis.weebly.com/uploads/1/3/4/8/134863987/9f3f9c0fcccc443.pdf
    • https://cdn-cms.f-static.net/uploads/4456676/normal_602d6a03de448.pdf
    • https://panusefebile.weebly.com/uploads/1/3/5/3/135331690/desiwari-tadeliziwa-bekikefawige-xipogida.pdf
    • https://cdn-cms.f-static.net/uploads/4402707/normal_6025fdcdac363.pdf
    • https://sajogosekatoja.weebly.com/uploads/1/3/4/6/134682383/7795661.pdf
    • https://cdn-cms.f-static.net/uploads/4420030/normal_600a1d7d90410.pdf
    • https://cdn-cms.f-static.net/uploads/4421966/normal_600c1cab2b345.pdf
    • https://xefafarorul.weebly.com/uploads/1/3/4/6/134698093/26464474fd64.pdf
    • https://xudagemiribu.weebly.com/uploads/1/3/1/3/131378943/6915651.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/5a5745cd-bec1-425b-bfd9-5dad04cc4a97/lowrance_x47_tx.pdf
    • https://uploads.strikinglycdn.com/files/f8349bab-6db9-4bb0-8dd1-fdd320ac086f/vokaduji.pdf
    • https://uploads.strikinglycdn.com/files/033b636b-4485-40cb-9cd2-fcec3eea7c87/36818843400.pdf
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_346227aa0cab49c597f514497015dc78.pdf?index=true
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_c6b88b9710a04e5fa0fd38e540436fd9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b149c420-1fb9-4852-8a12-69ba7dcbf6d1/reading_comprehension_sheets_3rd_grade.pdf
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_f02094324a2a475b9948e41ee41db60b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e4832d0b-a84e-4aba-8385-9e3a9a0363c9/leposijik.pdf
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_38eb64a9019d40e095a9f0c44a061b9b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/920fb397-6494-40bb-a179-23b01461cd28/what_is_the_best_pressure_cooker_out_there.pdf
    • https://uploads.strikinglycdn.com/files/acb2d801-b296-41e5-a105-43d18cb40a2d/can_you_put_stove_drip_pans_in_the_dishwasher.pdf
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_262f6ff15faf4c5080d8d2fa68d3a67a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d8125983-2ff0-43ec-bb00-deacccb3884e/wapijalutulopu.pdf
    • https://cee4c475-053c-4dec-97e8-987d41263e46.filesusr.com/ugd/8c25c6_dbf89d674e754f18a0e043ba03197125.pdf?index=true
    • https://uploads.strikinglycdn.com/files/96f7fa18-2606-4460-a882-d30cb89efd02/domafiwujedoke.pdf
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_ae1b43c874074f01bada3c80e9e479fa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7f592d53-4fb0-45ee-826c-b4c8d51ae02d/96219799926.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010a68.bin
1b5b40875e9975ff5ab32c6015f63e1c0c21703302fe4ba973a827fb67ca4fbb
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10A68 17516 bytes
font_00_sfnt_off0000d299.bin
a5681b63db0845abad2873f22f2eb1c6abce8a0488c9da0fba04b43e49319f95
pdf-font-stream PDF embedded font (sfnt) at offset 0xD299 5172 bytes
font_01_sfnt_off0000e3ed.bin
80b43d227d09e2960d5adc71b9c4c31880f47f7481837d7342b3be5daf8fa84a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3ED 11600 bytes
font_03_sfnt_off00012434.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12434 4324 bytes