Malicious PDF — malware analysis report

Static analysis result for SHA-256 2479a339cba448c9…

MALICIOUS

PDF

82.0 KB Created: 2021-06-08 19:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acfbe48082b318971103d5087eb038b1 SHA-1: a06926a0478c7cde92cc698ed2a5926c3aa3eca2 SHA-256: 2479a339cba448c9096205ed50c43a82fd635fc87dcdf8cc7adc59eb801aa2ff
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The primary external URI points to a URL that includes 'systematic literature review methodology pdf', indicating a lure. While no scripts were extracted, the high ML_NYX_PDF_MALICIOUS score and the presence of many external links strongly suggest malicious intent, likely related to driving traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pixomot.ru/pbw?utm_term=systematic+literature+review+methodology+pdf
    • https://cdn-cms.f-static.net/uploads/4426966/normal_6057dc2091503.pdf
    • https://static.s123-cdn-static.com/uploads/4443329/normal_5fcb71e9a0ac4.pdf
    • https://static.s123-cdn-static.com/uploads/4445877/normal_5ff17e1b8d908.pdf
    • https://nasoxuxelaleve.weebly.com/uploads/1/3/4/7/134744481/4f35f186c6e.pdf
    • https://cdn-cms.f-static.net/uploads/4417645/normal_605c08403225d.pdf
    • https://cdn-cms.f-static.net/uploads/4460076/normal_605d20e4bec99.pdf
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/kuxotegawobi_sejom.pdf
    • https://cdn-cms.f-static.net/uploads/4370073/normal_60466bd80fd3d.pdf
    • https://cdn-cms.f-static.net/uploads/4403264/normal_601e6159ebbd0.pdf
    • https://nenopejir.weebly.com/uploads/1/3/4/6/134603535/rivozifagew.pdf
    • https://babobulelemin.weebly.com/uploads/1/3/5/3/135344535/c16f0925474478.pdf
    • https://static.s123-cdn-static.com/uploads/4502336/normal_5ff500901dce0.pdf
    • https://cdn-cms.f-static.net/uploads/4467322/normal_603a44ff6f932.pdf
    • https://cdn-cms.f-static.net/uploads/4408463/normal_604f3a919c68c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8b9e4e89-1999-4d48-9405-6b97716b191e/zujaf.pdf
    • https://uploads.strikinglycdn.com/files/cc9c8d3f-462e-4611-b9f1-a258fc5e1fab/echo_cs_400_idle_adjustment.pdf
    • https://uploads.strikinglycdn.com/files/80b8b9dd-2f57-4ad6-b2f7-bd2c8923d2fc/whirlpool_cabrio_platinum_gas_dryer_manual.pdf
    • https://uploads.strikinglycdn.com/files/fb30d8cf-f7df-41b6-ae5d-c89a575e444a/luvirimoxitifek.pdf
    • https://uploads.strikinglycdn.com/files/2010c962-0b93-4233-8824-b16ba29ef203/xulafisagekawugimu.pdf
    • https://uploads.strikinglycdn.com/files/7d14eb75-560d-446d-9e74-45bbe58f4e24/62677037786.pdf
    • https://uploads.strikinglycdn.com/files/6cadcc9f-7c3e-44a4-bd23-6aafa7392667/3996626677.pdf
    • https://uploads.strikinglycdn.com/files/04cad4e2-d2c6-47e9-bad5-0f8083c97e31/donde_estan_las_rubias_mega_latino.pdf
    • https://uploads.strikinglycdn.com/files/4e304033-3f3f-402a-b2bb-e8287ca83f43/pigokirofi.pdf
    • https://uploads.strikinglycdn.com/files/6dd6ca7f-bc3c-4589-ab7a-657b214f428f/xevunireluboxif.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_off0001022e.bin
810d51a3749789e2524464186a2d9d552f40042665ed7773e74b000f7cad3424
pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 5928 bytes
font_01_sfnt_off00011647.bin
7ceb7bf50f5b407a5266c056044fb61f75d9bb2d2fc00888fb834bb098b39b81
pdf-font-stream PDF embedded font (sfnt) at offset 0x11647 10536 bytes