Malicious PDF — malware analysis report

Static analysis result for SHA-256 adadf37e005576c2…

MALICIOUS

PDF

78.0 KB Created: 2021-03-13 22:13:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1ff26b2fd81dc7dbd75ffa3ea17d9836 SHA-1: 28b0f0ef26973984e22fbf3d271afce39e1f43bb SHA-256: adadf37e005576c2583dcd550f744ca8a0d37cca849c275ee8843e2ffac647c0
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO manipulation or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the heuristic firings related to link farms suggest the primary goal is to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=tile+discount+code PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417313/normal_5fcbb147009f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479933/normal_6023fcc094944.pdfIn PDF document text
    • https://cdn.sqhk.co/xotakuzazuf/ibc7icQ/my_brcc_login.pdfIn PDF document text
    • http://mifirejetevina.getenjoyment.net/how_to_reset_my_roku_box.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/equivalencia_pulgadas_centimetros_tuberias.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/Oicw9vI/puffin_tv_browser_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8416b7a1-ce60-4c36-99db-978043ec8dec/graphic_designer_remote_jobs_canada.pdfIn PDF document text
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_f8fa2669d46a464691f16a22c1a899ea.pdf?index=trueIn PDF document text
    • http://rivetibixonapaz.myartsonline.com/54077729308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81b7b4ea-52a6-4b05-93d2-18106088d0bd/why_is_dbt_good_for_bpd.pdfIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_83403dfaf939409f95a995fcb3b9b866.pdf?index=trueIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_b5bdbf7155484d04a7ae3202d631f248.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/affdb6cf-e56e-4dcb-af75-0fd7d8fcb284/dexulaz.pdfIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_8ef8c739579845418489ca817c0a3a03.pdf?index=trueIn PDF document text
    • http://rizivubonulej.atwebpages.com/its_called_a_breakup_because_its_broken.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4f9828e-6c83-47e3-9c3a-684d74c990a1/nalc_contract_pay_raises.pdfIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_758eb6cdf5ff4fd78cdb47767db5bb0c.pdf?index=trueIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_c404cc39a45d49c1902576eb2c208e06.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce8d7c34-b552-4dfd-ae4e-de6187a97d76/acca_march_2021_exam_dates_deadlines.pdfIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_cdb8aeade56349759b365b1a229ffcc8.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 4576 bytes
SHA-256: 98c1428fabe355044281b2645ed3700219731ce6418fc5adc225735cfddeea5e
font_01_sfnt_off000101d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D5 11600 bytes
SHA-256: d3ad9c682c44fcb5bf020a35f49d7cb60a806861c250d63e55382aea677ddbb8