Malicious PDF — malware analysis report

Static analysis result for SHA-256 516a80803b5ec7d5…

MALICIOUS

PDF

100.6 KB Created: 2021-03-09 14:41:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1c0fb0bc12f2483af2b2ac87e8d784cf SHA-1: ab494a9c0de74962e4d4d4927be49f9ad75e02f6 SHA-256: 516a80803b5ec7d57ab3ed6141e0fa313b49e18f5dc05ae796baa84ef3a734fd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

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.
  • 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://xajibur.ru/123?utm_term=bdo+alchemy+stone+guide+2017 PDF link annotation
    • https://cdn.sqhk.co/nazalugewu/iciacjh/neduvanesalarilakon.pdfIn PDF document text
    • http://woxijakuzadajew.getenjoyment.net/introduction_to_java_programming_11th_edition_solutions.pdfIn PDF document text
    • https://cdn.sqhk.co/wigalefu/fjghdgj/56586418047.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafaveju/rihhhGM/police_siren_sounds_ringtones.pdfIn PDF document text
    • https://cdn.sqhk.co/felolavap/hjjiibN/microban_sanitizing_spray_bulk.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/78449b2e-6f7f-4c80-9454-fa2718e63f9f/data_structures_in_c_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4248b064-05eb-498d-9360-2688540a70b0/wefig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e692c9e-9389-4ad3-90f5-e5671f6b8ecb/adobe_premiere_pro_cs6_download_free_trial.pdfIn PDF document text
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_09f2b43cf8cd4b4cbd276f35313b6687.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4916a4d-bbe9-4c90-9250-579e02999dec/55955860808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c58b6bb-91e3-465c-b1eb-aaf2fed13201/machine_learning_definition_for_dummies.pdfIn PDF document text
    • http://muzulozak.atwebpages.com/what_is_a_legal_opinion_letter.pdfIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_26f5b98d78aa416e958c846409f1814d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9cff6f1-19f3-4918-8688-4944609850f8/does_jiffy_lube_change_transmission_fluid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0c46108-059d-4251-aa97-4b894840de9f/power_xl_air_fryer_cooking_times.pdfIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_f1f903e8f4af4873ab057916fe9730d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcdb5297-374c-49b3-8306-ae5faa847100/how_hard_is_ap_physics_c_electricity_and_magnetism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45787549-6111-47aa-b5a3-a6dcc76d1344/arturia_microbrute_used.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40b9d883-c9a1-4a3d-b630-c3197c67b203/why_is_samsung_fridge_not_making_ice.pdfIn PDF document text
    • http://tarepos.onlinewebshop.net/bar_brothers_workout_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aefd6e06-1f56-471e-93d3-218e574a1e3e/codependents_anonymous_literature_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a14e024a-2fd2-444b-bf1b-27f76a35a45e/viwuzuragexowanif.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_off000149f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F0 5812 bytes
SHA-256: dd3ce88fa7a3ecfb98f28c2b70058f79148fcf98e2a132978b98b41427d414bd
font_01_sfnt_off00015db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB2 11972 bytes
SHA-256: 9bcc225d2630107d33f97d035f746dfdcc162864bbf107e75c1582ca8a384000

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