Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2765019590e4c8…

MALICIOUS

PDF

75.2 KB Created: 2021-03-16 19:54:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 08f690201184dab1bffd1030a32a2ba5 SHA-1: 5283f369ae22f1d6ad9f8f0ac71a4f7ec158e19e SHA-256: aa2765019590e4c859cadc09b1ff5ac1e3929b6e4487f52254b0f689cf077d35
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 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/123?utm_term=bt+business+hub+5+user+guide PDF link annotation
    • http://sopesukenapad.scienceontheweb.net/the_twilight_saga_breaking_dawn_part_1_2011_watch_online_free.pdfIn PDF document text
    • http://timogefubor.22web.org/vojiwapugajinuzeju.pdfIn PDF document text
    • http://palawawez.mypressonline.com/kipidigutirapukowefotu.pdfIn PDF document text
    • http://vurovolapoza.mygamesonline.org/61595912997.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/neil_degrasse_tyson_joe_rogan.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/b3ce3db0-66ef-4a5a-82c8-9df76cc2c1cd/how_to_use_the_cybex_arc_trainer.pdfIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_1b9bde115cc844eea0fef789e47fd421.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/07f1b145-e973-438b-9455-7ccb03bc2dd1/nikamovabulidijoxufadomu.pdfIn PDF document text
    • http://tonezifimoraga.epizy.com/93417778057.pdfIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_2714b58395f54bf1a85c621e8c18e01a.pdf?index=trueIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_fecf6b5ba70545e5a024819e7b87c8db.pdf?index=trueIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_d9fc726aed8f47d68eac947970fd5ca3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/625b0c63-4d9d-4d7a-8190-167ba887cdf8/lameratuvurixesetow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/301a2d12-81a0-4ccb-8baa-fc7477ff8aff/how_to_fix_washer_shaking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/013d9fd8-059a-405b-97a9-a28e89f2954a/easy_healthy_frozen_fruit_smoothie_recipes.pdfIn PDF document text
    • http://wusepobokajed.rf.gd/what_is_the_purpose_of_reduce_reuse_recycle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a346f70-ae9b-4f71-b543-d7dce534ea24/possessive_pronouns_worksheet_for_class_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10eb7f25-f391-4921-b4de-2e487390dbcf/nagijini.pdfIn PDF document text
    • http://jipesofu.rf.gd/88891012322.pdfIn PDF document text
    • http://nopugorib.onlinewebshop.net/gebegofejer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f011cff-90d4-45d8-afff-c15de89188af/biologia_celular_y_molecular_de_robertis.pdfIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_3f938b5f313b4b28a761d98147b43432.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_off0000e8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B3 5156 bytes
SHA-256: 87861b386f8538326af264c2cfbc2b527a19a2bd3fda8c817147ef428f5967bd
font_01_sfnt_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 10672 bytes
SHA-256: 37210bf4be837fd84e068b8bfcbb73ba16520d4ed66b72f1042c224569479967