Malicious PDF — malware analysis report

Static analysis result for SHA-256 d291957217d67590…

MALICIOUS

PDF

102.0 KB Created: 2021-03-06 05:56:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cbc8f835818049fe0a8043966b27f6ae SHA-1: d8e0bcd819451bc4093b0c9baddbe000cbb20fdf SHA-256: d291957217d675909b465dce05fe7bfddb7e41597b0ab2f5de26390409ede23e
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 0.9994

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://fokemale.ru/wix?keyword=birds+of+maine+calls PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460473/normal_5fce76ef3f0d7.pdfIn PDF document text
    • https://cdn.sqhk.co/joxonorapa/lvDhiid/singing_pumpkins_projection_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/jbiaQhe/what_day_do_we_vote_for_president_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/gelowidabik/5ghifij/61288741128.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415518/normal_600402bfd20e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392463/normal_5ff70bcfd21bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408866/normal_601dd7aa671f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366005/normal_60040615ba474.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobuwaxegu/aZggjj4/65660203282.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://59f6271c-0e15-4f01-aa4a-20813595934c.filesusr.com/ugd/f34823_2064bdbc6083428b98cf6fdbbe2c0e2c.pdf?index=trueIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_f989276a56754d30850239740eb43f60.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5d58420-1eb8-4782-84ed-be71c56f5e5e/53617652337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/217dac26-b627-4a2d-8a85-debb2e4a7a0b/8064776842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cd7ef20-acc1-4f6c-8e45-3828732dc449/xederutekanotugisobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4cb0c32-c026-43df-944c-20bbafb160d8/shooting_an_elephant_commonlit_answer_key.pdfIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_f1ad811a9b5a403998920cf4316d8230.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3435357-3aab-460c-adbf-20e5360052a2/21675943297.pdfIn PDF document text
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_38b5d973718f4ebaa46c750c1d158dec.pdf?index=trueIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_9ebb82c96aee4a11aaba55807d974a55.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e8e35af-eff0-4854-a437-32c1d21543a0/podixidomitaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f73cc7af-395f-41b2-87db-6799b47d6d04/83989733339.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a4c684e-3c63-47da-ac61-6d66b0a06381/sezitezulafituxonak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f37d67b3-c885-4502-9f34-4f5483edadeb/formula_de_acido_clorhidrico__hidroxido_de_sodio.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001540c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1540C 5216 bytes
SHA-256: a4353424de63a7f8c9ebe2241465ce72e5aeb64e9e09e85327ee4e788145aaba
font_01_sfnt_off000165b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165B0 10980 bytes
SHA-256: 1477b1079ff37cfeca10b3c08abeace787349e4ec8d06154eb57842a3ca6b638