Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab13f4b11c1a299…

MALICIOUS

PDF

76.4 KB Created: 2021-03-14 04:05:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dc0be516046bfc7ccc0fd670a3e45e5a SHA-1: 92344da5c3d77da7ad99751388fd1a795e5cf8e2 SHA-256: 6ab13f4b11c1a299142506b1cda0d60338f0247d0d5ce505e95ab77bffa25063
216 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. It uses brand-impersonation credential phishing. 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 0.9997

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://xopisamu.weebly.com/uploads/1/3/0/7/130776659/7813762.pdf.
  • 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://jottigo.ru/strik?utm_term=ridgid+table+saw+r4512 PDF link annotation
    • https://xopisamu.weebly.com/uploads/1/3/0/7/130776659/7813762.pdfIn PDF document text
    • https://cdn.sqhk.co/mifodirula/jagfihb/atmos_energy_billing_phone_number.pdfIn PDF document text
    • https://wopatozobaw.weebly.com/uploads/1/3/2/6/132682171/4876746.pdfIn PDF document text
    • https://jubaluwaruzazux.weebly.com/uploads/1/3/2/7/132740890/6156630.pdfIn PDF document text
    • https://nuzupodulekego.weebly.com/uploads/1/3/4/6/134615520/pofiditufepo-ladapekekixebit-sutuvawusafuxim-robovotadolokux.pdfIn PDF document text
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/vovake.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/heJIAha/2020_can_am_defender_max_hd8_top_speed.pdfIn PDF document text
    • https://ralixuviromod.weebly.com/uploads/1/3/5/3/135345966/2215873.pdfIn PDF document text
    • https://wutotopuwa.weebly.com/uploads/1/3/4/4/134464713/jutujekikusanugutefo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/english_modal_verbs_exercises_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede2f8dd-eae7-4ed7-a915-a722bc5c7c54/nyu_langone_health_pension_service_center.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/danowedamukasetuk.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/nedivitulidat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/740f9b83-6d7e-4133-bfdc-43963dade05c/what_does_the_monster_say_in_geralds_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/869a7fcb-883c-454e-ad91-60167bb87fad/what_is_a_pass_fail_assignment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e6c65ea-2ed9-4af6-ac07-9036d765cffe/workcentre_7855_drum_cartridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e41d70f8-3bf6-4abe-9d95-f4ba816b5f31/vupogefufozaxefatejijip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/118708ed-40ab-44b9-8690-a0c6a1fc4e62/saxudupurijimiporureva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/891f7ab9-7424-430e-ac1f-9578713476b9/14425065929.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/nizaxuvivebotameviwet.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/vagudepumarozi.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_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 5628 bytes
SHA-256: 051b5a76d232d5cf72f726aabe66f8a28beaf6d083f7c865dff09bddbbd8c2ee
font_01_sfnt_off00010113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10113 10288 bytes
SHA-256: c3d123d5f34466eb67ad7865343cff0a70e3cfcafe6087bf617470e61e7383db