Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb0bb831426fc82…

MALICIOUS

PDF

73.2 KB Created: 2021-04-11 10:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b6453bce9f59e6b3c2f7744925f3961e SHA-1: 68237108f58e234dba7bf14d69975c77588885a9 SHA-256: feb0bb831426fc82591921e5bb74501fbcf6da3e34525d76c82aee598967e200
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing document and a link farm, with a high ML classifier score and ClamAV detection. The embedded URL points to a suspicious domain, likely intended to redirect the user to a malicious site for credential harvesting or further exploitation. The document body, though heavily obfuscated, contains text related to applying for a job, aligning with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=how+to+apply+to+work+at+planet+fitness PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1a7cb76-1ddd-4157-930b-35bed2fb6eb4/trig_functions_derivatives_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/audi_car_video_free.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/html_email_signature_template_thunderbird.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12f18d33-80ba-4a19-9fdd-1d117ac76ca7/25914962.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbadab71-bd23-407f-b135-482b452cce90/43894858929.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/rental_agreement_format_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/volume_of_cones_worksheet_amazing_mathematics.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/zawokipomorez.pdfIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_6a72be12983d4a09a63fdfee5bc719b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xalasawu/xaxupom.pdfIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_5c8398ea23a4498e8aab50024f77e618.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kujapomib/aetna_clinical_policy_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0920a73f-3ef8-49f2-82a9-31ccc4848dac/flash_s_bounty_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/android_id_changer_root_apk_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e4f5ad-bff3-4863-8216-214e7b24c446/who_owns_raynor_garage_doors.pdfIn PDF document text
    • https://19527f6f-7821-4b33-8e58-d909ab9a203f.filesusr.com/ugd/b18fc6_63f5723f2b4a49ff8f4ace6847bb1c79.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pujirageg/70789319609.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/muzeb.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_off0000e14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 5112 bytes
SHA-256: daa800e2ed0f84dd5c45fb5f4a7b57c9f29f16922873ea21924740378ffbb969
font_01_sfnt_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 10740 bytes
SHA-256: 5d27d18b36b038595945a729bcce0b0fa32ab1b879f59c2d6f952fdb9dc2a895

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