Malicious PDF — malware analysis report

Static analysis result for SHA-256 7706b2ad1072b8ac…

MALICIOUS

PDF

83.2 KB Created: 2021-03-28 16:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d413ac3964b28b51164d71de43565499 SHA-1: c66c4d65a8e28166a4e41a56daf3e91b611a0e7a SHA-256: 7706b2ad1072b8aca31ffefe3f8d9492605d35fa4ecc36eb8dcd40c6ff7d34a4
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 0.9998

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://jumiwimov.ru/strik?utm_term=which+css+framework+is+best PDF link annotation
    • http://medilawibume.scienceontheweb.net/73726748362.pdfIn PDF document text
    • https://tumenunomowet.weebly.com/uploads/1/3/0/7/130775025/2014546.pdfIn PDF document text
    • https://zimuvudiredefux.weebly.com/uploads/1/3/2/7/132710782/lanulojede.pdfIn PDF document text
    • https://balixilime.weebly.com/uploads/1/3/1/3/131398392/kutovololigiweve.pdfIn PDF document text
    • http://jukejed.mypressonline.com/86525189934.pdfIn PDF document text
    • http://xeberok.getenjoyment.net/xixenozowajogil.pdfIn PDF document text
    • https://vezerovir.weebly.com/uploads/1/3/4/5/134580053/zexizetage.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/turimivewakevobakajobupe.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/1ed70aca-0845-4c38-9d0e-b020a0a47fac/where_is_the_goddess_statue_memory_in_zelda.pdfIn PDF document text
    • https://c22e5cf4-338a-4003-9cad-c1cb0be29285.filesusr.com/ugd/3db607_66cc8eeaa9984e3fa78de544028cde43.pdf?index=trueIn PDF document text
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_fc6a3f92005e4783b1f4d6b21bcef5a3.pdf?index=trueIn PDF document text
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_372abc6d32564e97b622255a75ae8f3f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3c99b32-afd0-4e3d-acf7-3caf94841c76/yoga_anatomy_leslie_kaminoff_amy_matthews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/630b3c2e-4428-4bb8-9e6f-949f7c2af0b8/parrot_ck3100_bluetooth_car_kit.pdfIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_3c00765f01ef4b639849ee96878ef91c.pdf?index=trueIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_288e17faa3c44bb2a3aedbb50fccc202.pdf?index=trueIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_70716b2682fb4ba1b2eeb2f061b1e450.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gazivemon/41454092143.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/florida_realtors_lease_agreement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/917641f0-4e0a-4c38-8c2c-5c78c4aafc3a/14508657714.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_off0001078f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 5400 bytes
SHA-256: 397149428d906e90a68786eda5ca58ebae708df1f3cdb88ae4dfe134f7571326
font_01_sfnt_off000119dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DD 11256 bytes
SHA-256: 2256c583e212199c4ab7e4a3d448f71897c627989ccea3408072ce61041b1778