Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc2cb0616ce220c…

MALICIOUS

PDF

79.5 KB Created: 2021-03-14 14:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bdc8d49321481a56f22c5806504e52ca SHA-1: 859971b201129a85c3925038b480019513b140a9 SHA-256: ebc2cb0616ce220cb25c0f6414fe1022f85470cb7f561d7b1cfbe4cf0185eb43
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 0.9994

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://druttle.ru/123?utm_term=covering+letter+for+job+application+format+sample PDF link annotation
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/jataremuvoderes.pdfIn PDF document text
    • https://wajuzetixageg.weebly.com/uploads/1/3/0/9/130969085/4931548.pdfIn PDF document text
    • http://xivisugewikoju.iblogger.org/google_cloud_machine_learning_tutorial.pdfIn PDF document text
    • https://pifaxatopegamu.weebly.com/uploads/1/3/4/1/134108845/5c148.pdfIn PDF document text
    • http://madalez.22web.org/razer_blackwidow_tournament_edition_stealth_keyboard.pdfIn PDF document text
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/5b539275e80076e.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/f2f3aa35-62ef-48a9-b5f3-3376e917dc86/gapejotegejivobez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d5a9ebe-3bc9-4f05-9a0f-dc5d73a0ee13/kenmore_70_series_washer_heavy_duty_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4799faba-3945-4c1a-ac3f-f79c5cc40155/piraxosizubudifipewerox.pdfIn PDF document text
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_1ff504695e1e47b2bda1722816313c59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/google_play_store_services_apk.pdfIn PDF document text
    • http://vavazewesepato.epizy.com/bhoot_fm_free_fusion_bd.pdfIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_9b9c94441e334ce89abc78c56bcd2c07.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/507fd667-d3a1-45ea-a974-90a388cbb055/what_are_the_seashells_for_in_links_awakening.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24049f0b-3d5c-4b84-99ce-459b5d281475/how_to_amend_a_2016_tax_return.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d97f3a2c-c7e7-4966-8558-4ace7ded1ce5/easy_detox_diet_plan_3_days.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f544096-643d-49e7-a6cf-f1f53d78e4f5/41660411728.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ca1fc5c-8e97-4408-8459-a7e9361a0eec/risizoxegosogame.pdfIn PDF document text
    • http://favugepotepegal.rf.gd/dexejune.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/cancer_screening_ontario_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/dozipowulamutib.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/miscellaneous_award_pay_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/bbc_learning_english_for_pc.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_off0000fb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0D 5516 bytes
SHA-256: 96fbfae4430b84230b1817d3ee3c06697cb901b455909e0fb82f5a760dd14d93
font_01_sfnt_off00010dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC7 10072 bytes
SHA-256: 671b144118c1ffed99fe7653407007c7ec63ef42f7bc1f49b132b5ce3677cd06