Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5efb348484d5038…

MALICIOUS

PDF

123.2 KB Created: 2021-04-06 00:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e79adfe15f7d8a1574a03ce4bbf2c075 SHA-1: d6428f0f4fe9bb54e796d58b3c60ad789bd8c469 SHA-256: f5efb348484d50383b473cc6c8a1818aa09970a8850449f82a108cfc6b1a2664
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm for SEO manipulation or to host malicious content. One of the primary URLs, https://botokaw.ru/strik?utm_term=pioneer+vsx-1021-k+reset, is likely part of a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/strik?utm_term=pioneer+vsx-1021-k+reset
    • https://static.s123-cdn-static.com/uploads/4426812/normal_5ff81db7882a6.pdf
    • https://cdn.sqhk.co/wazikunal/ijlijif/xowidewemujeka.pdf
    • https://cdn.sqhk.co/fagisuxupinu/fnRFCq6/chargepoint_stock_ticker_symbol.pdf
    • https://cdn-cms.f-static.net/uploads/4372086/normal_60677947a896b.pdf
    • http://libralab.digital/liverpool_vs_barcelona_4-_0_full_gamee277q.pdf
    • https://cdn-cms.f-static.net/uploads/4381102/normal_6038c8ad2114a.pdf
    • http://form-copyrightservices.com/dafiribemugoduna76xb3.pdf
    • https://cdn-cms.f-static.net/uploads/4414339/normal_604bb8cee6e8a.pdf
    • https://cdn-cms.f-static.net/uploads/4367622/normal_604fbe6615b7b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/faluzotixupi/77017933502.pdf
    • https://uploads.strikinglycdn.com/files/8d538405-2d1b-4929-98cb-30149c2e75c3/90949141889.pdf
    • https://76aaed32-5cd4-4d1c-8dfc-7c94b4e0b227.filesusr.com/ugd/23a6c3_b6076cc232434530bfdae2ca79468d72.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7411e6c3-6425-46fb-86ef-7b96ba7f5526/what_are_the_5_deadly_sins.pdf
    • https://s3.amazonaws.com/fejenijovekozu/51798815834.pdf
    • https://uploads.strikinglycdn.com/files/fd6a714b-49ac-418e-9dd8-610dfe3b7b54/bevezilit.pdf
    • https://s3.amazonaws.com/kuboki/rakixevasojiwuwumaxat.pdf
    • https://uploads.strikinglycdn.com/files/78e27353-12a6-42ae-9289-56edb753ba08/line_6_pocket_pod_guitar_amp_modeling_processor.pdf
    • https://s3.amazonaws.com/bidemewufa/36250010941.pdf
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_12beaaf991ca4efa91a39abe52ff2a78.pdf?index=true
    • https://s3.amazonaws.com/befafuni/quiz_on_periodic_table.pdf
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_c029b9f40d084bb382b8090112c5e992.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_off0001a1ee.bin
55d226917114d6cdb20184cfef1adc44576f0093d287235c0dc9b363976f2369		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1EE 4988 bytes
font_01_sfnt_off0001b313.bin
44445b2fb1da07c353c1fc597f705f38390251ee0e61bd57fbdc4e7e537e2756		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B313 13132 bytes

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