Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68548b0d3c7fe27…

MALICIOUS

PDF

79.0 KB Created: 2021-05-24 13:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4635f8267dc4c679a9bfd31d82467fc7 SHA-1: 2c022370fea518be879cc461ace4f598e4201740 SHA-256: a68548b0d3c7fe27f11ef6b20ffc34aec929719bca3cc48d174c48efe79872e6
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a security-bypass lure. 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 7

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://gimoguvi.ru/strik?utm_term=what+is+the+best+virus+protection+for+windows+7+free PDF link annotation
    • https://bolojowugupi.weebly.com/uploads/1/3/4/8/134886087/4349194.pdfIn PDF document text
    • https://xisevulatunetu.weebly.com/uploads/1/3/4/5/134595014/1294607.pdfIn PDF document text
    • https://vuworuvadile.weebly.com/uploads/1/3/1/6/131637376/2462285.pdfIn PDF document text
    • https://virefogagivagu.weebly.com/uploads/1/3/0/8/130815228/f3c7b6.pdfIn PDF document text
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/1001324.pdfIn PDF document text
    • https://kumufovuteli.weebly.com/uploads/1/3/4/6/134607328/nefogidarum.pdfIn PDF document text
    • https://jizimixu.weebly.com/uploads/1/3/4/0/134095846/lamanizuj_nobitoluf_norotelipuwa.pdfIn PDF document text
    • https://nasoluludeg.weebly.com/uploads/1/3/4/4/134435301/kivawovoref_mitorotifabo_zixinaz.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/94d792f4-b0f6-4d8c-b366-c31f40c15727/77880033094.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/229705281.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/shareit_app_2018_jio_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8562513b-aa31-4055-aea7-6895964899d2/87885438722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fb41f2e-eabe-4dca-9103-80480aa7be71/49298966949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d0fa6ce-b307-4dee-870b-c51e1dc4af76/hp_probook_6560b_price_in_uae.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f58c194-2401-4397-9394-80487bd048da/75451469789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca51337d-e448-49d1-a089-ff9a1caf08b0/56769056884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5492e6b-0067-47a3-8165-308c272d6e89/15265120131.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/47520339903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6de6474e-9645-4595-975b-7ab7f60c6282/35643127049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b95c778e-0549-4283-8423-9be6db7c1423/97890164408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0e39a52-86db-4a80-9c45-f22243907fc4/un_mundo_feliz_resea_literaria.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/ecommerce_bootstrap_template_github.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8895c80-2ff1-4fbc-91b8-105c4a9095be/which_type_of_yoga_is_best_for_stress_and_anxiety.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_off0000f67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 5596 bytes
SHA-256: 0c57d38cdd6d1a9e98ee5cfced89549a4247024712cdc7bdeb6f7c8091d72968
font_01_sfnt_off00010997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10997 10908 bytes
SHA-256: 211601c8770edcfb509ba40a45633287e91f85111d46b0e335cb04c8c66b9185