Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f25bb856d39d26…

MALICIOUS

PDF

84.6 KB Created: 2021-03-28 23:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cdf480da351543c4866e295419e8f649 SHA-1: 2371ecc20738642720d22ce719996b8ac6cd6a96 SHA-256: e9f25bb856d39d263d6fd48a85feba5393c4a1e0faf6a339e7dffc04bec5b3b0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=types+of+conducting+polymers+pdf PDF link annotation
    • https://kupujusurigov.weebly.com/uploads/1/3/4/4/134471221/fb627.pdfIn PDF document text
    • http://fonujameritules.getenjoyment.net/burmese_language_basics.pdfIn PDF document text
    • https://vemetufubejukat.weebly.com/uploads/1/3/4/3/134367776/1298398.pdfIn PDF document text
    • https://gajuleli.weebly.com/uploads/1/3/1/8/131871701/8276537.pdfIn PDF document text
    • https://sitofozaliwi.weebly.com/uploads/1/3/4/3/134355749/6332510.pdfIn PDF document text
    • http://jidudilubad.mygamesonline.org/les_principes_de_l_agriculture_biologique.pdfIn PDF document text
    • https://zuwiliwiwira.weebly.com/uploads/1/3/1/0/131071082/ea4e89fd4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://giworutiw.myartsonline.com/tinagiladotat.pdfIn PDF document text
    • http://lewinozed.atwebpages.com/14240680063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0aaf85e-3054-4b92-a231-55af3e01710e/navy_counseling_chit_for_being_late.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c7fb5dc-3aa1-49e8-81a6-2776ce48fe8a/evenflo_pivot_travel_system_-_stroller_and_carseat.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/vawudatesulenagupix.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/vonajemibesutu.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/kakaostory_for_pc_free.pdfIn PDF document text
    • https://7e574f8b-ef34-4833-8dee-b18f3ac9fc91.filesusr.com/ugd/af8ffd_0242dfc0528f4382bf74ea5b7d2f5448.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c072694e-e0fd-4c29-b9cf-b991cfd9dc4a/77105470934.pdfIn PDF document text
    • http://palelezugob.onlinewebshop.net/estudios_biblicos_para_la_vida.pdfIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_f0f6d262e60d48fb93917052cc9e5b77.pdf?index=trueIn PDF document text
    • https://2acf176d-1645-44e4-83be-c67f7ac9af6b.filesusr.com/ugd/e72dd6_8a375188fc3b4f24acfdfcf0df99e935.pdf?index=trueIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_c18f511ad09240cd934466de7d6f1863.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/96126365377.pdfIn PDF document text
    • https://a134ef9b-a212-4d8e-a35f-da3d896bbd40.filesusr.com/ugd/dadc92_113dfe67b761496c9552a2e362a6c739.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001008c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008C 5196 bytes
SHA-256: 310b95d330f5eb10ce9587d18989abc15ea1d14504cf44d1abc92703aa168176
font_01_sfnt_off0001122f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122F 10596 bytes
SHA-256: 1255c68537916a95365a949d35f1bcd7d7c10cc3b88c77119e9c3e100c85671b
font_02_sfnt_off00013671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13671 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361